CTFs as you need them
Ze Text Adventure game Builder : Create as you play !
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Arianne is an engine to develop multiplayer online games like Stendhal
Old-school 2D game engine
INSTEAD - Simple Text Adventure Interpreter.
German Extension for Inform 7
Multidocument automation by templates - for sphinx, mkdocs, epydoc ...
A complete web framework to create online Fighting Fantasy adventures
Portable game engine with main focus on point-and-click adventures
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Event driven concurrent framework for Python
evolution for vegastrike SpaceSim/Combat/Trade game
A 2D Adventure Game & Engine
AutoTeach makes kids study and learn in exchange for internet access.
A mobile tower 3D tower defense/defend the flag game
A world editor for HGE game engine written in python and uses OpenGL.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A retro style video game engine for RPGs and adventure games.
A graphics engine + toolkit.