Neverwinter Nights 2
Neverwinter Nights 2 is an RPG by Obsidian Entertainment and Atari featuring the Dungeons & Dragons 3.5 edition rules. It had 3 official expansions and despite its age its still alive thanks to the Electron Toolset that enabled the community to develop countless modules and even smale scaled MMOs on private servers. The toolset is still popular and new modules are developed regularily.
wikipedia entry for Neverwinter Nights 2
The material I provide for Neverwinter Nights 2 consists mostly of character blueprints/prefabs.