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

Hayago

A minimalist go/chess clockMIT

Giant Stopwatch

Stopwatch and clock with giant digitsMIT

Just 24 Hours

A free and open source app that shows a large digital clockMIT

Zham

Offline world clock with a home-screen widget and time-zone converter.GPL-3.0-or-later

RomanDigital

Digital Clock App and Widget with Roman Numeral DisplayApache-2.0

Klock

A simple chess based clock applicationGPL-3.0-or-later

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

reteclock

Full-screen digital clock and dock screensaver for old Android phones.MIT

Octal Sun Time

A clock for solar time in the octal number systemGPL-3.0-only

Valentin's PowerTools #036 - Ease The Waiting

A mix between a calendar and a clock that makes you wait faster.GPL-3.0-only

BinClockWidget

AMOLED-black monochrome binary-clock home-screen widgetGPL-3.0-or-later

Fokus Launcher

Minimal launcher with clock, weather, fast app search, and gesture navigation.GPL-3.0-only

QRAlarm

Disable alarms with a QR scannerGPL-3.0-only