http://swik.net - http://swik.net/about
Swik is a directory for open source software. It is similar to a wiki in that anyone can edit/create new pages without logging in. It has a bit more structure than a wiki (a template of pages is provided for each project). It also supports tagging (similar to http://del.icio.us ) so various projects can be related together.
http://swik.net/project/Tcl - is Tcl's project listing