Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
GoatTracker - This is a crossplatform C64 music editor.
Anchor CMS - Free and lightweight blogging system
OnlineSequencer.net - OnlineSequencer.net is an online music sequencer that allows users to create beats and music tracks.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Jummbox - A modified Beepbox that have more stuff then Beepbox. It can be used just like Beepbox. The features of Jummbox is the same of Beepbox's features, but Jummbox have more stuff to offer.