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