The www.tcl.tk%|%Tcl Developer Xchange , (aka TDX), the official website of Tcl and Tk, is based on the ArsDigita Community System ACS and hosted by ActiveState (and was inherited from Scriptics, Ajuba Solutions, Interwoven).
[http://resource.tcl.tk/%|%resource.tcl.tk%|%resource.tcl.tk] [JCW]: IMO, a page which deserves more attention (dead in 2013-01)
Access is open to anyone, adding/maintaining entries requires a simple login so the identity of contributors can be established.