Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A cross platform Lua based game engine
A real-time game development platform
A 2D game engine and level editor
Free and Open Game Programming Language for Windows and GNU/Linux
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
The Old PacMan! programed over the Salvat Game Fabric platform
2D game engine for traditional platform games
Single-/multi-player card game Mau Mau (similar to UNO®)
Mahasona engine is an open source game engine.
Cross-platform C framework very compact libraries and tools.
C++ Framework for slot machine games
Retro pong clone implemented using sfml
An Animated 2D Game in the Turbo Compiler.
Convert Ren'Py visual novels into a format your ebook-reader knows
A very small multi-platform game engine for creating desktop games.
big map framework using Irrlicht
Investigo - DX9 Performance and Debugging Toolkit
A C++ library for programmers transitioning from "Game Maker Language"
Cross-platform 2D game engine