A game framework written with osu! in mind.
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
Javascript Canvas Framework
Simple data driven web based gamebook engine using javascript.
evolution for vegastrike SpaceSim/Combat/Trade game
Mahasona engine is an open source game engine.
Engines for Batch Games
also download updates from files section
Make games with Lego-like building blocks