The software running this site. Think 'Wiki on Steroids' but trivially easy for everyone to install.
See http://www.projectforum.com for full info, documentation, downloads if you'd like to run your own. We're also offering to host ProjectForum sites for Tcl open source projects on this machine - see http://tcl.projectforum.com.
We'd absolutely welcome any comments or suggestions about this software (and wouldn't complain if anyone felt like buying a copy either!). Please contact Mark Roseman.
And yes, it probably goes without saying, but it's written in Tcl. :-) My paper at the Tcl2003 conference describes some of the approaches used to make it nicely self contained; see http://www.markroseman.com/tcl