Learn something
Clever ways to learn, practice and see the world differently.
Free
Bartosz Ciechanowski’s explainers
Interactive essays on how things work
No installWeb
FreeLichess
Free chess with no ads, forever
No installWeb · iOS · Android
FreeMerlin Bird ID
Hear a bird? Find out what it is
iOS · Android- Free
Neal.fun
A collection of wonderful web toys
No installWeb 
Free to startRadio Garden
Spin a globe, listen to live radio anywhere
No installWeb · iOS · Android
Free to startAnki
Flashcards that know when you are about to forget
Mac · Windows · Linux · Android · iOS · Web- Free
Explained Visually
Math ideas made visual and interactive
No installWeb Free
Flexbox Froggy
Learn CSS layout by guiding frogs to lily pads
No installWebFree to start
Hemingway Editor
Makes your writing bold and clear
No installWeb · Mac · WindowsFree
Learn Git Branching
Learn Git with a visual, game-like tutorial
No installWebFree to start
Mochi
Friendly Markdown flashcards and notes
No installWeb · Mac · Windows · Linux · iOS · Android
FreeMonkeytype
A minimal, very customizable typing test
No installWeb
FreeOddsSimply
Sports betting odds explained in plain English
No installWeb- Free
Seeing Theory
Probability and statistics you can play with
No installWeb - Free
Shadertoy
Browse and write mind-bending graphics code
No installWeb 
Free to startSky Guide
Hold your phone up to the stars and see their names
iOS
Free to startStellarium Web
A planetarium in your browser
No installWeb
FreeThe Evolution of Trust
A 30-minute game about why we trust each other
No installWeb
FreeWorldle
Guess the country from its shape
No installWeb
Free to startZoom Earth
Live satellite weather for the whole planet
No installWeb