OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/
RPG Maker 2000/2003 and EasyRPG games interpreter
Unreal Engine 4 Action RPG type game starter kit.
H2服务器引擎架构是轻量级的，与其说是引擎，个人觉得称之为平台更为合适。因为它封装的功能少之又少，但是提供了非常简洁方便的扩展机制，使得可以用C++、python、lua、js、php来开发具体的服务器功能。H2引擎的灵感来源于web服务器Apache。
Modular game engine built with MonoGame, with GMS2-like workflow and advanced level editor
🎨: RPG map maker (paint tool)
Open Source role-playing game engine for Taleworlds' Mount&Blade Series written in C# using Ogre3d Engine
Official Hamster Republic RPG Construction Engine (mirror of SVN repository)
Old-school CRPG engine, editor and game
The version IDMarinas Edition is based on the version 1.1.2 Dragonprime by Dragonprime Development Team (Dragonprime) and have code of Oliver Brendel (NB Core).
A free, open-source, fully editable RPG Maker alternative. !!! HEAVILY WIP PROJECT !!!
2D Open world ascii rpg game written in Python 3, standard library