Orx: Portable Game Engine
cross-platform sound-playing package for C++ apps
Zoomable user interface (ZUI) with file manager, file viewers and more
scriptable game engine with built-in support for 2D graphics and sound
3D video music media player lyrics subtitles etc...
Fast and robust map analyser for Brood War.
Highly portable Gameboy Color emulator
Entex Adventure Vision emulator with debugging capabilities.
A C++ library for programmers transitioning from "Game Maker Language"