TX Library is a tiny graphics library for Win32 written in C++.
Orx: Portable Game Engine
Small lightweight program to customize your keyboard
A 2D game engine and level editor
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Small OpenGL based game enegine
TurboSphere is an easy to learn and powerful JS based game engine.
A game development kit for Sifteo Cubes.
A very small multi-platform game engine for creating desktop games.
Read and write PGN format and test moves for legality.
A small Game Engine project.