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
Official binding of SFML for .Net languages
Gideros Release version
A simple, physics-based animation library
A Phaser CE plugin that brings sloped tile collision handling
Advanced numerical instruments: adaptive meshing, FE methods, solvers