Alarm Klock
An alarm clockApache-2.0
Japanese Traditional Time
Clock widgetMIT
Dynamic Night Light
Low brightness clockApache-2.0
Fossify Clock Beta
Handy, lightweight, open-source clock app with essential features.GPL-3.0-only
SecondsClock
Clock with seconds as widget or fullscreenGPL-3.0-or-later
おやつ Oyatsu
Seasonal time system clock 不定時法時計 ウィジェットGPL-3.0-or-later
Clock31
Clock + Calendar combo widget for AndroidGPL-3.0-only
Terminightor
Alarm clock based on NFC tagsGPL-3.0-or-later
Giant Stopwatch
Stopwatch and clock with giant digitsMIT
Just 24 Hours
A free and open source app that shows a large digital clockMIT
Hayago
A minimalist go/chess clockMIT
Zham
Offline world clock with a home-screen widget and time-zone converter.GPL-3.0-or-later
Klock
A simple chess based clock applicationGPL-3.0-or-later
RomanDigital
Digital Clock App and Widget with Roman Numeral DisplayApache-2.0
TickTock
Pendulum clock beat asymmetry analyzerGPL-3.0-or-later
Poker Payout
Poker timer and blind clock for Texas Hold'em home games: payouts, buy-ins, bankMIT
Schule
simple educational practice game for kids and adults: maths, clock, spellingGPL-3.0-or-later
NightDream
Clock, screensaver & radio with dynamic brightness & custom layouts.GPL-3.0-or-later
Octal Sun Time
A clock for solar time in the octal number systemGPL-3.0-only
NoChoice Alarm
An alarm clock you can only stop with a QR code or a math problemGPL-3.0-only