Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
Blueshift is a cross-platform 3D game engine implemented in C++
Portable game engine with main focus on point-and-click adventures
Web powered cross-platform 3D, WebXR game engine
a 2D Game Development Framework
3D-Accelerated open-source DOOM engine
SJCE - free portable cross-platform graphical chess game, 100% Java.
Children's learning programming language Karel the Robot in 3D
Based on the raedwulf-et project
Compatible client of Ace of Spades 0.75
A Marathon (first-person shooter) engine with enhanced features
OpenSAGE is a free, open source re-implementation of SAGE
Javascript Canvas Framework
Build Cross-platform Applications
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Quake Engine Map Viewer
EDGE is an advanced DOOM source port
A console/ncurses chess engine frontend and PGN editor.
A project to create a blazingly fast Swift game engine
Genealogy software