Orx: Portable Game Engine
TX Library is a tiny graphics library for Win32 written in C++.
Open Game Bootstrap
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
c# lua bind with unity3d project for game development
Cross platform Game Creation Software
Gives agents personality, moods, emotions and emotional attachments.
A generic 2D engine for any kind of game
A basic 3D environment with a first-person POV
Cross-platform reimplementation of AMOS BASIC (runtime)
easy programming language for 2d games