Box2D

Home: https://box2d.org/
State: mature
Keyword: library, 2D, physics
Code repository: https://github.com/erincatto/Box2D.git (@created 2015, @stars 7171, @forks 1427)
Code language: C, C++, Objective-C
Code license: zlib
Developer: Erin Catto, Isaac Burns, Jarrod Mosen

Building

Build system: premake