Action RPG that's easy to mod
provide an intro to storyboard or scripting and make a rpg framework
RTSish Game Engine
A RPG maker engine using Pygame
A fast, scalable, distributed game server engine/framework for C++
Ur-Quan Masters High Definition
Harp Character Suite
Lightweight framework for old-school RPG GUI in web!
Random generators for tabletop RPG games (D&D, Pathfinder, D20, etc)
The IRC's Talking Robot
TurboSphere is an easy to learn and powerful JS based game engine.
The Map-Editor of the 2D role-playing game Arengu
A small tool for supporting Pen and Paper Roleplaying.
Readable Password Generator
WhiteDogRPG is A-PHP-RPG engine.