Calendar

284 open source Calendar apps

Everyone's Timetable
APK
Everyone's Timetable is a mini social network for sharing timetables in your school. * Save your own timetable in a school-specific format, so you'll have easy access to it all the time. * Find timetables for other people in your school. No more hunting down timetables on professor's websites! * Add or update a timetable for someone else, who can't be bothered to do it themselves. Currently supports the following schools: Seneca College, Sheridan College. Contact us to add support for your school! The app needs internet access to find, download, and update timetables but can be used without an internet connection if all you want to do is look at a timetable you already have in your list.
F-Droid
F
FOSDEM 2026 Schedule
APK
Conference program app for the FOSDEM conference https://fosdem.org About FOSDEM FOSDEM is a free event that offers open source communities a place to meet, share ideas and collaborate. Every year, thousands of developers of free and open source software from all over the world gather at the event. Features * View program by day and rooms (side by side) * Custom grid layout for smartphones (try landscape mode 🙃) and tablets * Read detailed descriptions (speaker names, start time, room name, links, ...) of events * Search and filter through all sessions * Add events to favorites list * Export favorites list * Setup alarms for individual events * Add events to your personal calendar * Share a website link to an event with others * Keep track of program changes * Automatic program updates (configurable in settings) * Vote and leave comments on FOSDEM talks and workshops * Integration with the c3nav indoor navigation project https://nav.fosdem.org * Integration with the FOSDEM room status API https://api.fosdem.org 🔤 Supported languages (Event descriptions excluded) * Danish * Dutch * English * Finnish * French * German * German (Austria) * Italian * Japanese * Lithuanian * Polish * Portuguese (Brazil) * Portuguese (Portugal) * Russian * Spanish * Swedish * Turkish 💡 Questions regarding the content can only be answered by the FOSDEM content team. This app simply offers a way to consume and personalize the conference schedule. 💣 Bug reports are very welcome. It would be awesome if you can describe how to reproduce the particular error in the issue tracker at: https://github.com/EventFahrplan/EventFahrplan/issues 🏆 The app is based on the EventFahrplan app https://f-droid.org/packages/info.metadude.android.congress.schedule which was initially built for the camp and annual congress of the Chaos Computer Club. The source code of the app is publicly available on GitHub at: https://github.com/johnjohndoe/CampFahrplan/tree/fosdem-2026. 🎨 The name FOSDEM and the gear logo are registered trademarks of FOSDEM VZW. Used with permission.
F-DroidGitHub
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FOSDEM Companion
APK
Advanced schedule browser for the FOSDEM conference in Brussels, Belgium. Download the most recent schedule and browse it offline. Features: * Browse sessions by day and by track * Instant search * Track schedule view optimized for phones and tablets * Full sessions details with related links, speakers info and room maps * Add sessions directly to your calendar * Share sessions with a link to their page on the FOSDEM website * Manage bookmarks and get notified when a bookmarked session is about to start * “Live” view: during FOSDEM, watch the realtime updated list of currently running and upcoming sessions * Includes a simple map of the site. Note: this app properly handles timezone changes and device reboots for notifications; you can download the schedule and add bookmarks on any timezone and you will get notified at the right time when the events start in Belgium. The name FOSDEM and the gear logo are registered trademarks of FOSDEM VZW. Used with permission.
F-DroidGitHub
FOSS4G 2024 Schedule
APK
https://2024.foss4g.org About FOSS4G FOSS4G is the acronym for Free and Open Source Software for Geospatial. It is the annual recurring global event hosted by OSGeo, the non-profit organization that supports and promotes the collaborative development of free and open source geographic technologies and open geospatial data. The conference covers all kinds of topics related to geospatial information and earth observation openness from Software development to Transition to FOSS4G, Use cases and applications, Education and research and Open data. This event is for all kinds of people interested in sharing experiences about maps, from developers who write code to users of geomatics software, people who make decisions, researchers, students and anyone who wants to learn, share and meet like GIS interested people. It attracts over 1,000 practitioners and advocates for free and open source software for geospatial and the tendency is to increase this number every year. It is the main meeting place and educational outreach opportunity for OSGeo members, supporters and newcomers - to share and learn from one another in presentations, hands-on workshops and a conference exhibition. For appreciating the quality and variety of the presentations, you can watch video recordings of past FOSS4G events on the FOSS4G YouTube channel (https://www.youtube.com/c/FOSS4G/) Features * View program by day and rooms (side by side) * Custom grid layout for smartphones (try landscape mode 🙃) and tablets * Read detailed descriptions (speaker names, start time, room name, links, ...) of events * Add events to favorites list * Export favorites list * Setup alarms for individual events * Add events to your personal calendar * Share a website link to an event with others * Keep track of program changes * Automatic program updates (configurable in settings) * Vote and leave comments on talks and workshops 🔤 Supported languages (Event descriptions excluded) * Danish * Dutch * English * Finnish * French * German * Italian * Japanese * Lithuanian * Polish * Portuguese (Brazil) * Portuguese (Portugal) * Russian * Spanish * Swedish * Turkish 💡 Questions regarding the content can only be answered by the FOSS4G content team. This app simply offers a way to consume and personalize the conference schedule. 💣 Bug reports are very welcome. It would be awesome if you can describe how to reproduce the particular error in the issue tracker at https://github.com/EventFahrplan/EventFahrplan/issues. 🏆 The app is based on the EventFahrplan app which was initially built for the camp and annual congress of the Chaos Computer Club. The source code of the app is publicly available on GitHub at: https://github.com/Smarzaro/Foss4g2024Schedule/tree/foss4g-belem-2024. 🎨 FOSS4G 2024 logo is CC-BY-ND 4.0.
F-DroidGitHub
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FOSS4G Europe 2025
APK
Conference program app for the FOSS4G Europe 2025 conference in Mostar, Bosnia-Herzegovina https://2025.europe.foss4g.org About FOSS4G The Free and Open Source Software for Geospatial Europe (FOSS4GE) conference is the European branch event of the Open Source Geospatial Foundation (OSGeo) annual conference. OSGeo is the largest and most important international organization that unites the community of developers, users, and advocates of free and open source in geospatial. The main focus of the organization is fostering the development, maintenance, and use of free and open source software for geospatial, open standards, and open data. The democratizing nature of the field creates a basis for sharing geographic data, promotes cooperation between organizations and individuals, and enables the application of data in solving the most diverse everyday problems, being the basis for such fields as map applications, logistics, transport, infrastructure planning, organizing rescue work in disaster areas, etc. FOSS4G is a community event organized by volunteers, with a focus on building a diverse and sustainable open community, sharing our own experiences, and learning from others. Although it is software that brings us together, it’s the deep care for the society and the environment that surrounds us, helping solve the World’s problems one bit at a time, that connects us. Features * View program by day and rooms (side by side) * Custom grid layout for smartphones (try landscape mode 🙃) and tablets * Read detailed descriptions (speaker names, start time, room name, links, ...) of sessions * Search through all sessions * Add sessions to favorites list * Export favorites list * Setup alarms for individual sessions * Add sessions to your personal calendar * Share a website link to an session with others * Keep track of program changes * Automatic program updates (configurable in settings) * Vote and leave comments on talks and workshops 🔤 Supported languages (Session descriptions excluded) * Danish * Dutch * English * Finnish * French * German * Italian * Japanese * Lithuanian * Polish * Portuguese (Brazil) * Portuguese (Portugal) * Russian * Spanish * Swedish * Turkish 💡 Questions regarding the content can only be answered by the FOSS4G content team. This app simply offers a way to consume and personalize the conference schedule. 💣 Bug reports are very welcome. It would be awesome if you can describe how to reproduce the particular error in the issue tracker at https://github.com/EventFahrplan/EventFahrplan/issues. 🏆 The app is based on the EventFahrplan app which was initially built for the camp and annual congress of the Chaos Computer Club. The source code of the app is publicly available on GitHub at: https://github.com/johnjohndoe/CampFahrplan/tree/foss4g-2025. 🎨 FOSS4G Europe Mostar 2025 logo: Creative Commons, CC-0.
F-DroidGitHub
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FOSSGIS 2026 Schedule
APK
Programm zur FOSSGIS-Konferenz am 25. - 28. März 2026 in Göttingen https://www.fossgis-konferenz.de Die FOSSGIS-Konferenz ist im D-A-CH-Raum die führende Konferenz für Freie und Open Source Software für Geoinformationssysteme sowie für die Themen Open Data und OpenStreetMap. Funktionen * Tagesüberblick über alle Programmpunkte * Beschreibung von Veranstaltungen lesen * Veranstaltungen in persönlicher Favoritenliste verwalten * Alle Veranstaltungen durchsuchen und filtern * Favoritenliste exportieren * Alarm für Veranstaltungen setzen * Veranstaltungen in Kalender eintragen * Link zu Veranstaltungen mit anderen teilen * Programmänderungen einsehen * Veranstaltungen bewerten * Integration mit dem Helfersystem, https://helfen.fossgis.de (siehe Einstellungen in der App) * Integration mit Chaosflix https://github.com/NiciDieNase/chaosflix - Android App für https://media.ccc.de, teile Fahrplan-Favoriten mit Chaosflix und importiere sie als Bookmarks 🔤 Unterstützte Sprachen (Programmtexte ausgenommen) * Dänisch * Deutsch * Deutsch, Österreich * Englisch * Finnisch * Französisch * Italienisch * Japanisch * Litauisch * Niederländisch * Polnisch * Portugiesisch, Brasilien * Portugiesisch, Portugal * Russisch * Spanisch * Schwedisch * Türkisch 💡 Inhaltliche Fragen zum Programm kann nur das FOSSGIS-Team beantworten. Diese App stellt lediglich die Programmpunkte zur Verfügung. 💣 Fehlerberichte sind herzlich willkommen, aber achte darauf, dass du erklärst, wie man den Fehler reproduzieren kann. Der Issue-Tracker findet sich hier: https://github.com/EventFahrplan/EventFahrplan/issues 🏆 Die App basiert auf der EventFahrplan-App https://f-droid.org/packages/info.metadude.android.congress.schedule/ für den Kongress des Chaos Computer Clubs. Der Quellcode der Anwendung ist auf GitHub https://github.com/johnjohndoe/CampFahrplan/tree/fossgis-2026 zu finden. 🎨 FOSSGIS-Logo-Design: Jane Eder
F-DroidGitHub
FallASleep - Device sleep timer
APK
Setup a timer between one and 60 minutes. Once the timer runs out, the app will lock your device's screen. Features: Simple and clean designLock screen after 1 to 60 minutesRemembers last timerQuick setting tileNotification to stop, extend or reset timer Permissions: Device admin to lock the screen
F-DroidGitHub
Floating Timer
APK
The Floating Timer app features both a countdown timer and stopwatch that will float on top of other running apps. This app is useful to time activities such as: Exam practice, gaming speed runs (speed-running), gaming boss fights, cooking.Usage:Drag to move timer positionTap to start / pauseDouble tap to resetDrag to trash to exitPremium version unlocks:Simultaneously run more than 2 timers (multiple timers)Change Timer size and colorOpen source: https://github.com/tberghuis/FloatingCountdownTimer
GitHubIzzyOnDroid
Florae
APK
Florae is an open source application that will allow you to keep track of the care of your plants while respecting your freedom and privacy. Set reminders for basic plant care such as watering, pruning, cleaning, fertilizing, spraying, rotating, and transplanting. Consult future plant cares for better planning of your time, adjust the frequency of care alerts and don't forget to water your plants ever again.
F-DroidGitHub
Flux
APK
Flux – Flow Through Your Workspace with Ease Experience the power of continuity and simplicity. Flux helps you stay organized with a modern design and focused workflow. 🎉 Features 📝 Sleek, Minimalistic Design powered by Material UI (Material 3) 🌟 Workspace Templates: Structure your work with custom workspaces 🔐 Biometric App Lock to keep your data secure 🚀 Frequent Updates & Improvements to enhance your flow Stay in control, stay in motion — download Flux and experience seamless productivity.
F-DroidGitHubIzzyOnDroid
Fokus
APK
Fokus is an open source application that combines a todo list and a calendar that can help you manage your school related work and events in one place. It’s fast and beautiful yet simple design that can help you focus on what matters most.Features:Get reminded when a task is nearing its dueGet reminded about incoming eventsAdd attachments to your tasksPersistent notifications for important tasks or eventsNo ads or any trackingOpen Source CodeOn-Device Database
GitHubIzzyOnDroid
Fomodoro
APK
Fomodoro is a simple, customizable Pomodoro timer Android app designed to help you focus and manage your work/break sessions efficiently. The app features a clean UI, dark mode, AMOLED mode, and flexible session settings.Features:Pomodoro timer with customizable focus, short break, and long break durationsAdjustable number of sessions per cycleAuto-start sessions optionDark mode and AMOLED mode supportSimple, distraction-free interfaceVibration feedback for button actionsEasy access to settings and GitHub repository
GitHubIzzyOnDroid
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Foreground
APK
Foreground is an easy to use task manager app. Designed to be beautiful, simple and unintrusive, Foreground helps you know what needs done without getting in your way. Foreground also supports syncing with Taskwarrior servers. Syncing To set up sync, add your taskwarrior server credentials (provided by your taskd server or a service like inthe.am or FreeCinc) to the settings menu, and enable sync using the toggle. A test will be run to check if the settings are valid, and the enable will stick if the config works. You can also configure automatic syncing in this menu, or click the sync button on the main page to start a sync. Implementation Details Unlike existing Taskwarrior apps for Android, Foreground does not run the taskwarrior binary inside, but rather implements a taskwarrior sync client. This allows for greater device compatibility and simplifies UI development but it can cause issues when syncing if not done correctly. Current Limitations Foreground currently supports most features of Taskwarrior. Notable exceptions involve handling of recurring events and display/editing of User Defined Attributes. Recurring event instances created by other clients will be shown by Foreground, but Foreground does not create recurring event instances of its own at this time. User Defined attributes are preserved internally but are not yet exposed for viewing or editing. These limitations will be resolved in future releases.
F-DroidGitHub
Fossify Calendar
APK
Tired of cluttered calendars and privacy concerns? Fossify Calendar is here to change that. Your open-source powerhouse for managing life, designed with privacy as its core and packed with powerful features to keep you organized. Here's what makes Fossify Calendar different: 🚫 AD-FREE AND PRIVATE: Your events remain yours. No ads, no tracking, no intrusive permissions. ⏰ FLEXIBLE AND CUSTOMIZABLE: Craft events precisely with times, durations, reminders, and advanced repetition rules. 🔄 SEAMLESS SYNCING: Sync effortlessly with Google Calendar, Outlook, Nextcloud, Exchange, and more. 🎨 PERSONALIZE YOUR PLANNER: Set custom sounds, looping audio streams, vibrations, and themes to match your preferences. 🌈 VIBRANT WIDGETS: Brighten your day with beautiful calendar widgets and themes for your home screen. 📅 EFFORTLESS DAY MANAGEMENT: Plan your day with ease, whether you're a busy professional or a family organizer. 🎉 IMPORT CELEBRATIONS: Never miss a birthday or anniversary! Easily import holidays and special dates. 🔍 FILTER VIEWS: Quickly find what you're looking for with event filters. 📆 MULTIPLE VIEWS: Switch between daily, weekly, monthly, yearly, and event views effortlessly. ✨ MATERIAL DESIGN ELEGANCE: Enjoy an intuitive and user-friendly interface with dynamic themes. Plus, Fossify Calendar is open-source! Join the vibrant community on GitHub, contribute to the project, and make it uniquely yours. Download Fossify Calendar now and experience the power of a private and customizable schedule. Explore more Fossify apps: https://www.fossify.org Open-Source Code: https://www.github.com/FossifyOrg Join the community on Reddit: https://www.reddit.com/r/Fossify Connect on Telegram: https://t.me/Fossify
F-DroidGitHubIzzyOnDroid
Fossify Clock Beta
APK
Introducing Fossify Clock – the ultimate timekeeping companion designed to enhance your daily routines and promote better sleep habits. With a multitude of functions tailored to your needs, Fossify Clock seamlessly integrates into your life, offering unparalleled convenience and versatility. ⌚ MULTIFUNCTIONAL TIMEKEEPING: Experience the power of versatile time management with Fossify Clock. From serving as a clock widget to functioning as an alarm clock and stopwatch, this app is your go-to tool for regulating your daily activities and improving your overall lifestyle. ⏰ FEATURE-RICH ALARM: Wake up refreshed with Fossify Clock's comprehensive alarm features. Set multiple alarms with options like day selection, vibration toggle, custom labels and ringtone customization. Enjoy gradual volume increase and a customizable snooze button for a pleasant waking experience. With a user-friendly interface, setting up alarms has never been easier. ⏱️ CONVENIENT STOPWATCH: Track your activities with precision using Fossify Clock's stopwatch function. Measure longer periods or individual laps effortlessly. You can also sort your laps in ascending or descending order. ⏳ PRECISE TIMER FUNCTIONALITY: Stay on top of your tasks with Fossify Clock's versatile timer feature. Customize ringtone preferences, toggle vibrations, and pause countdowns to suit your needs. Whether you're timing cooking intervals, managing study sessions, or ensuring timely breaks, Fossify Clock has you covered with precision and ease. 🌈 CLOCK WIDGET WITH CUSTOMIZABLE FEATURES: Transform your home screen with Fossify Clock's customizable clock widget. Adjust text color, background color, and transparency. Choose between analog or digital clock to suit your style and easily access essential time information at a glance. 🎨 CUSTOMIZABLE INTERFACE AND THEMES: Enjoy a personalized experience with Fossify Clock's material design and dark theme options. Tailor the app to your preferences with customizable colors and themes, enhancing usability and reducing eye strain, especially in low-light environments. 🔒 PRIVACY-FIRST APPROACH: Rest assured knowing your privacy is protected with Fossify Clock's offline operation. Experience maximum privacy, security, and stability without sacrificing functionality or convenience. 🌐 AD-FREE & OPEN-SOURCE: Say goodbye to intrusive ads and unnecessary permissions. Fossify Clock is ad-free, fully open-source, and grants you complete control over your timekeeping experience. Upgrade your time management skills, optimize your routines, and prioritize better sleep with Fossify Clock. Download now and take control of your time like never before. Explore more Fossify apps: https://www.fossify.org Open-Source Code: https://www.github.com/FossifyOrg Join the community on Reddit: https://www.reddit.com/r/Fossify Connect on Telegram: https://t.me/Fossify
F-DroidGitHubIzzyOnDroid
Foto Timer
APK
Foto Timer for Android is a free, open source app that can count and beep. It helps with repeating tasks, such as at the gym. People also use it for developing analogue film, or for meditating. Foto Timer is working with "processes", which define how Foto Timer counts, and how often it beeps. Processes can also be "chained" together, meaning that a process can automatically launch another. There is almost no limit to how complex your timers can be. If you want to see what Foto Timer looks like, take a look at the manual. If you prefer a "how to" approach, learn how to use Foto Timer for Tabata exercises. Foto Timer contains absolutely no AI whatsoever.
F-Droid
Fourth Tools
APK
100% FOSS! Currently available tools: * Calculator * Timer (Stopwatch) * Temporary file hosting Dark mode is fully supported!
F-Droid
French Calendar
APK
Resizable widget which displays the current date and time in the French Revolutionary calendar. The widget supports the following preferences: * Whether to display the current time, or the name of the object for that day of the year (ex: grape). * Calculation method: method used to determine the first day of the year: Either based on the autumn equinox, or the Romme method. * Language of the calendar (limited to just a few languages for now). Other features: * Possibility to share the information about the current date. * The color of the widget is customizable, but by default is different for each month. * You can add the widget to your lock screen (on supported devices). Three widget styles: * Horizontal parchment * Vertical parchment * Minimalist
F-DroidGitHub
Friend Alert
APK
FriendAlert: Keep Your Friendships Thriving, No Matter How Far Apart Life's adventures lead us to friendships that cross cities, countries, and even continents. While these connections add immeasurable value to our lives, keeping them vibrant across distances can be a challenge. Born from this universal struggle, FriendAlert is your go-to solution for keeping those important friendships alive and well. Functions The application offers a simple reminder to remember to contact your friends: you can set how often you want to keep in touch and every time you call a friend you can record that inside the app. If you do not call one of your friends for a time longer than the limit you set, you'll be sent a notification. 🌍 Your Central Hub for Global Friendships Whether your friendships were formed on the playground or during an international journey, FriendAlert functions as your unified platform for sustaining these invaluable bonds. With FriendAlert, neither miles nor time zones can weaken your connections. 🗣️ Foster Authentic Connections: More than Just Check-ins Social media may offer cursory updates about people's lives, but it's no substitute for genuine conversation. FriendAlert encourages you to engage in meaningful dialogues that go beyond the superficial. A Personal Perspective I created FriendAlert with the aim of maintaining contact with the people who matter most to me. While the app's utility can vary, here are some personal guidelines I follow: Use FriendAlert to track those you find you're losing touch with, not the friends you see regularly. Although in-person meetings are irreplaceable, phone or video calls serve as excellent alternatives when that's not feasible. Texting, though convenient, falls short in conveying emotional nuance and should not be your primary mode of communication. Engaging via social media—such as liking photos or commenting—simply doesn’t cut it when it comes to nurturing real friendships. Elevate Your Social Ecosystem FriendAlert emerged from a personal need for an accessible, budget-friendly way to sustain my social circle. While platforms like nouri.ai have their merits, FriendAlert offers a free and user-friendly alternative. Sharing good moments is nice. Let's enrich not just our conversations, but our lives and communities through stronger, more meaningful connections.
F-Droid
GDF HEMA Timer
APK
GDF HEMA Timer is a precise and minimal timer designed for Historical European Martial Arts (HEMA) training. It helps fencers, instructors, and tournament organizers manage timing during drills, bouts, and sparring sessions. Features: - Simple interface with large, readable display - Configurable round and break durations - Audible and vibration alerts for start and end signals - Preset saving for repeated training routines - Works fully offline, with no ads or tracking - Open-source and lightweight This timer is developed by practitioners for practitioners, focusing on reliability and clarity during intense training sessions.
F-DroidGitHub
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GPN 2025 Schedule
APK
Programm App für die Gulaschprogrammiernacht. https://gulas.ch Die Gulaschprogrammiernacht (kurz: GPN) ist ein 4-tägiger Kongress, der vom Entropia e.V. (CCC Karlsruhe) einmal jährlich veranstaltet wird. Der Name ist bei der GPN wörtlich zu nehmen, denn immer wieder schafft es auch ein Haufen Hacker eine große Menge Gulasch zuzubereiten, um die Gäste zu nähren, damit sie gestärkt zum nächsten Vortrag - über Programmierung oder Gesellschaft - oder zum Programmieren ins Hackcenter gehen können. Funktionen: * Tagesüberblick über alle Programmpunkte (Vorträge, Workshop, Lounge) * Beschreibung von Veranstaltungen lesen * Veranstaltungen in persönlicher Favoritenliste verwalten * Alle Veranstaltungen durchsuchen * Favoritenliste exportieren * Alarm für Veranstaltungen setzen * Veranstaltungen in Kalender eintragen * Link zu Veranstaltungen mit anderen teilen * Programmänderungen einsehen * Bewertungen und Kommentare für Vorträge und Workshops hinterlassen * Integration mit dem Trollsystem https://engelsystem.de - Online-Tool für Helfer- und Schichtplanung auf großen Events * Integration mit Chaosflix https://github.com/NiciDieNase/chaosflix - Android App für https://media.ccc.de, teile Fahrplan-Favoriten mit Chaosflix und importiere sie als Bookmarks 🔤 Unterstützte Sprachen (Programmtexte ausgenommen) * Dänisch * Deutsch * Englisch * Finnisch * Französisch * Italienisch * Japanisch * Litauisch * Niederländisch * Polnisch * Portugiesisch, Brasilien * Portugiesisch, Portugal * Russisch * Spanisch * Schwedisch * Türkisch 🤝 Du kannst mithelfen, die App zu übersetzen. Siehe Link hier. 💡 Inhaltliche Fragen zum Programm kann nur das Content-Team der GPN beantworten. Diese App stellt lediglich das Programm zur Verfügung. 💣 Fehlerberichte sind herzlich willkommen, aber achte darauf, dass du erklärst, wie man den Fehler reproduzieren kann. Bitte nutze den Issue-Tracker: https://github.com/EventFahrplan/EventFahrplan/issues. 🏆 Die App basiert auf der EventFahrplan-App https://play.google.com/store/apps/details?id=info.metadude.android.congress.schedule für den Kongress des Chaos Computer Clubs. Der Quellcode der Anwendung ist auf GitHub https://github.com/johnjohndoe/CampFahrplan/tree/gpn-2025 zu finden. 🎨 Logo-Design von Thilo Billerbeck
F-DroidGitHub
GetFlow
APK
GetFlow is an application based on the Pomodoro Technique that helps you stay productive and accomplish your long-term goals. Statistics will give you the motivation to stay focused and show how you improve over time. How It Works 1. Pick a task you want to accomplish. 2. Work on the task for 25 minutes. 3. Take a 5-minute break. 4. After four sessions, take a 20-minute break. Features * Start, pause, skip and stop timer using gestures * Support for short and long breaks * User-created activities such as reading, programming * Support for different timer settings in each activity * Block applications during work * Enable Do Not Disturb and disable Wi-Fi during work * Full screen mode * Keep screen on * AMOLED-friendly * Statistics with an overview, history chart, and activity distribution * Entirely ad-free and open-source * All features available to all users, no in-app purchases * Doesn’t require an internet connection or account registration * Your data is never sent to anyone
F-DroidGitHub
Giant Stopwatch
APK
Sports stopwatch with: giant digits and adjustable theme (color, font, size, spacing, format) control with both on-screen buttons and volume buttons lap-timer delayed-start (with audio 3...2...1... countdown). Free, small, no ads, open source (github.com/arpruss/simplestopwatch). As a bonus, includes a giant number clock (swipe to switch between clock and stopwatch). I made this so I could easily see the time while rock climbing at the gym 50 feet up. It's also useful poolside for swimming, and for other sports where you need to see the time from a distance (or close up, if you want).
F-DroidGitHub
Giggity
APK
Giggity loads xcal/Pentabarf/frab XML files (that contain schedules of conferences/festivals/other events) and lets you browse them in various convenient formats. Preseeded with many events including FOSDEM, CCC, FrOSCon, etc. Giggity lets you organise your visit - select talks to be reminded of (with warnings in case of conflicts) or hide the topics you're less interested in. Schedules are shown in whatever format you like - block schedules, plain timetables, or a clear now-and-next screen on the day itself.
F-DroidGitHub