Purpose: List for The Tcler's Wiki user a number of the popular Tcl source and documentation resources.
There are a number of popular set of sites attempting to catalog Tcl software. The Dirty Dozen links point to several of these - see that page for the biggies.
... at this point, add any links that have not yet been mentioned ...
Tcl/Tk's expand package collect site http://tcltk.co.kr/phpBB2/viewforum.php?f=6