Learning
Get smarter: 70+ apps, all free and open source.
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In testing
AnkiDroid
Remember anything with smart flashcards
Echo Loop
Practise English listening and speaking with your own audio
OpenBot
Turn your old phone into a robot's brain
Wikipedia
The official app for the free encyclopedia
BOINC
Lend your phone's spare power to science
PSLab
A pocket science lab on your phone
Linux Command Library
Look up Linux commands and terminal tips offline
Sky Map
Point your phone at the sky to name the stars
jidoujisho
Learn a language by tapping words in video, books and manga
Look4Sat
Know when the space station flies over you
Kiwix
Wikipedia in your pocket, no internet needed
Medito
Meditation and sleep sessions, free forever
Shiguang Schedule
Keep your class timetable, with reminders and widgets
Moodle
Your school or university coursework in your pocket
whoBIRD
Name the bird you can hear, right where you stand
Firebird
Run a TI-Nspire calculator on your phone
Fushi
Look up words in books, manga and video, then make flashcards
Kanji Dojo
Practise writing Japanese characters
microMathematics Plus
Do maths on a worksheet and watch the graphs update
phyphox
Turn your phone's sensors into a physics lab
Breathly
Guided breathing to calm down or fall asleep
Hoshi Reader
Read Japanese books and look up any word instantly
Oppia
Free, friendly lessons that work even without internet
QuickDic
Offline dictionaries for dozens of language pairs