Open source library for creative expression on the web, desktop, etc.
Reactive extensions for Unity
Orx: Portable Game Engine
Asphyre is a cross-platform framework for Delphi and FreePascal.
INSTEAD - Simple Text Adventure Interpreter.
A starter development kit that let you develop FF6-like games on PC.
3D .NET engine for Windows, Linux, Mac
Molecular viewer and prototyping framework
8-bit Graphical API for Java
A lightweight HTML5 Game Engine
Decodes the login credentials stored by the minecraft launcher
Old-school 2D game engine
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Java Gamepad API for multiple platforms
German Extension for Inform 7