Polite Droid
Calendar toolGPL-3.0-only
Taswast
Amazigh CalendarGPL-3.0-only
MinCal Widget
Minimal Calendar WidgetBSD-3-Clause
Clock31
Clock + Calendar combo widget for AndroidGPL-3.0-only
Goals & Checklists - timeto.me
Goals, checklists, tasks, repetitive tasks, calendar and 24/7 time tracking.GPL-3.0-or-later
Kolab Client
Sync contacts/calendarGPL-3.0-only
My Brain
Productivity app for Tasks, Notes, Calendar, Diary, Bookmarks and moreGPL-3.0-only
Elements
Chinese zodiac five elements as a pageable calendarMIT
EteSync - Secure Data Sync
Secure, private and end-to-end encrypted calendar, contacts and tasks syncGPL-3.0-only
Suntimes Calendars
A calendar provider add-on for Suntimes.GPL-3.0-or-later
Valentin's PowerTools #036 - Ease The Waiting
A mix between a calendar and a clock that makes you wait faster.GPL-3.0-only
NoFb Event Scraper
Import Facebook-Events to the calendarGPL-3.0-only
Broccoli: The Green Recipe App
Recipe manager, cooking assistant, seasonal calendar: the eco-friendly cookbook.GPL-3.0-only
Linwood Flow Nightly
Feature rich event, group and time management systemAGPL-3.0-only
Holidayz
Public and Regional Holidays for 100+ CountriesGPL-3.0-only
OneTimeAlarm
Alarm reminders which delete themselves automatically after firing. GPL-3.0-or-later
Casio G-Shock Smart Sync
Add smart functions to your Casio square BT G-Shock Watch.MIT
Timed Silence - Don't let your phone rattle you!
An app that manages your phones volume. It will mute your phone for you!GPL-3.0-only
Reservator
Display availablity of meeting roomsBSD-3-Clause
Diary
Personal diary or journalGPL-3.0-only