A version of TinyMUSH 1 originally by Nils McCarthy cleaned up alot of broken stuff for release with a Class/Level/Power based security system. Later on another team picked up TinyMUSE and got permission to release TinyMUSE '97 with even more bug fixes, however the TinyMUSE line eventually died off for PennMUSH/TinyMUSH/TinyMUX servers people have grown use to as being more stable.