Compilation of BIOSes for various emulation platforms

Godot Engine – Multi-platform 2D and 3D game engine

not xna.

Android client for netpods

A game design tool inspired by Bret Victor's Inventing on Principle talk

Verge 4 Looool!

An implementation of VERGE using XNA.

2D game engine in js and canvas

Experimenting with HTML5 canvas game

A simple, highly customisable, data-driven 3D carousel for iOS and Mac OS

A collection of useful .gitignore templates

Tasks.Show WPF Sample Application

A free 2D game engine with Lua scripting, designed with rapid prototyping in mind.

2d game engine in XNA