Xash3D FWGS engine
Embeddable unity game engine view for Flutter
GemRB is a portable open-source implementation of the Infinity Engine
Game engine supporting many 3D/2D formats and graphic effects
Free and Open Game Programming Language for Windows and GNU/Linux
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
2D physics engine for games
cross-platform 2d game engine