Pymunk is a easy-to-use pythonic 2d physics library
Easy to use Python library for creating 2D arcade games
Phaser is a free and fast 2D game framework for making HTML5 games
2D GPU-accelerated framework for ActionScript developers
Official binding of SFML for .Net languages
Ct.js is a desktop game engine that makes learning programming fun
Gideros Release version
A Logo-like 3D environment, implemented in Nim
A Phaser CE plugin that brings sloped tile collision handling
Cocos2d for iOS and OS X, built using Objective-C
Advanced numerical instruments: adaptive meshing, FE methods, solvers
A Deformable Medical Image Registration Toolbox
2D physics engine and simulation