Pymunk is a easy-to-use pythonic 2d physics library
Phaser is a free and fast 2D game framework for making HTML5 games
Easy to use Python library for creating 2D arcade games
2D GPU-accelerated framework for ActionScript developers
Official binding of SFML for .Net languages
Gideros Release version
Ct.js is a desktop game engine that makes learning programming fun
A Logo-like 3D environment, implemented in Nim
A simple, physics-based animation library
a 2D Game Development Framework
A Phaser CE plugin that brings sloped tile collision handling
Software for calculating geometric properties of cross sections
Advanced numerical instruments: adaptive meshing, FE methods, solvers
2D physics engine and simulation