Arianne is an engine to develop multiplayer online games like Stendhal
Cooperative multiplayer graphical RPG and adventure game
Defeat all the beasties to claim victory!
The ECE is for creation and managing ED3+ED4 characters.
A graphical frontend for PbeM like Eressea
A suite of tools for any RPG system
Creates D&D monsters for use with Pathfinder ruleset
RPG character generator for RPG d20 systems.
A Text RPG
KCG is the (N)PC generation tool for the Kontinuum RPG system.
Old School gaming tool for GMs of AD&D/OSRIC.
Hitman Bukkit Plugin by Arasus
Simple GUI to create a CYOA Build-logfile.
DiaT is a Textadventure
A tool for roleplaying gamemasters
Free MMORPG Engine. Develop and host graphical browser-based games.