Java/JavaFX/Kotlin Game Library (Engine)
Arianne is an engine to develop multiplayer online games like Stendhal
GemRB is a portable open-source implementation of the Infinity Engine
Action RPG that's easy to mod
General Purpose Engine for Graphic Adventures.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
Heros of Jin Yong 3D Remastered
2D Game Engine
A RPG maker engine using Pygame
A fast, scalable, distributed game server engine/framework for C++
A fantasy RPG.
A space race game in the style of A Dark Room
3D urban environment renderer : browser-app ; as well as a GTA clone
plugin-based RPG manager in C++ and Qt5