Arianne is an engine to develop multiplayer online games like Stendhal
Traditional roguelike game with pixel-art graphics
GM tool for the RPG game "Legend of the Five Rings" 4th edition
GemRB is a portable open-source implementation of the Infinity Engine
An in-progress 2D tactical RPG
Yet another Pathfinder Character Generator
General Purpose Engine for Graphic Adventures.
Turn based tactical RPG with several campaigns, written in Rust
Heros of Jin Yong 3D Remastered
Bitburner Game
Defeat all the beasties to claim victory!
2D Game Engine
The ECE is for creation and managing ED3+ED4 characters.
Ur-Quan Masters High Definition
A fast, scalable, distributed game server engine/framework for C++