Free game engine for development of desktop, mobile, and web games
A dead simple 2D game engine for Go
Game engine to build text adventures.
PyCAPGE - Python Classic Adventure Point and Click Game Engine
A game engine for console based text games
2D Game Engine
A 2D game engine and level editor
A small text based game engine (VB.Net)
TurboSphere is an easy to learn and powerful JS based game engine.
A truly extensible cross-platform game engine
"Abysmal Depths" is a simple C++-based text adventure game engine.
A DirectX based graphics/physics engine