Java Gamepad API for multiple platforms
3D Game engine
Modular Gaming Open Source Persistent Browser Based Game Framework
Take the chess graphism, and use it with a chess engine.
C++ Framework for slot machine games
TR Game Engine allows you to develop your game quickly and easily.
This pack add's custom object and rides into your "RCT3 Platinum" game
A cross-platform game framework based on OpenGL and GObject.
A multiplatform game engine for interactive fiction experiences
2D Game Engine, based on OpenGL and focused on Isometric Games
Extremely simple joystick rumble / vibration library
3D game engine for C and C++
Retro pong clone implemented using sfml
A graphics engine + toolkit.
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
Pear3DEngine is a modern and modular 3D development framework
C-Lesh is a game programming language for 2D games.
An open source C++ console based game (Windows only).
cross-platform 2d game engine
I am working on upgrading the XNA Platform Game Template.
Powerful html5 & javascript library for creating applications & games.