TurboSphere is an easy to learn and powerful JS based game engine.
Text Based Game Engine and Parser
A point-n-click adventure game engine for GameMaker: Studio
A Game Engine
A multiplatform game engine for interactive fiction experiences
A Simple Game Engine
C++ Text Adventure Engine
A 3D, fully concurrent game engine
A 3d game engine on stage3D
Turn Based Game Engine (GMS GML)
a flexible game engine
BxEngine For Marmalade And QT
Distributed game engine
A 2D java game engine
2D - 3D game engine
Role Playing Game Engine
A retro style video game engine for RPGs and adventure games.