Arianne is an engine to develop multiplayer online games like Stendhal
A simple pen- and-paper RPG
Cooperative multiplayer graphical RPG and adventure game
RPG Maker 2000/2003 and EasyRPG games interpreter
Naev is a 2d action/rpg space game, action, rpg and simulation
Java/JavaFX/Kotlin Game Library (Engine)
A fantasy roguelike game with graphics tiles.
A standalone UQM mod made to enhance gameplay and visuals
Final Fantasy VIII Save Editor
GemRB is a portable open-source implementation of the Infinity Engine
Yet another Pathfinder Character Generator
Updated emulator of Forgotten Realms: Unlimited Adventures
Convert fixed-format RPG code to free-form RPGILE code
Action RPG that's easy to mod
iRPGUnit Testing for RPG Developers on IBM i
RDi/WDSCi plugins for JCRCMDS.com
An unmodified version of the MMORPG Impressive Title by KovuLKD
KildClient is a powerful MUD client with a built-in Perl interpreter