Learning
Get smarter: 60+ apps, all free and open source.
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In testing
Breathly
Guided breathing to calm down or fall asleep
Spell4Wiki
Record your voice to help build free, open dictionaries
Oppia
Free, friendly lessons that work even without internet
microMathematics Plus
Do maths on a worksheet and watch the graphs update
PSLab
A pocket science lab on your phone
Kiwix
Wikipedia in your pocket, no internet needed
KBBI
The official Indonesian dictionary, right on your phone
phyphox
Turn your phone's sensors into a physics lab
QuickDic
Offline dictionaries for dozens of language pairs
Sky Map
Point your phone at the sky to name the stars
Moodle
Your school or university coursework in your pocket
BOINC
Lend your phone's spare power to science
Firebird
Run a TI-Nspire calculator on your phone
Bodhi Timer
A quiet full-screen countdown timer with meditation bell sounds
Linux Command Library
Look up Linux commands and terminal tips offline
Sugarizer
Dozens of learning activities for children, from the OLPC Sugar platform
Wikipedia
The official app for the free encyclopedia
Adapt It Mobile
Help translate between languages that are close cousins
AnkiDroid
Remember anything with smart flashcards
iNaturalist
Find out what plant or animal you just saw
Binaural Beats
Tone sessions for sleep, focus and relaxation