The '''Tcl Developer Xchange''' (aka TDX) is a site based on the ArsDigita Community System [ACS].  It can now be reached via the most Tcl-centric URL the web has to offer:
        http://www.tcl.tk/

This site is hosted by ActiveState (and was inherited from Scriptics, Ajuba Solutions, Interwoven).

It also contains a resource, which deserves more attention (IMO, [JCW]):
        http://resource.tcl.tk/

Things you will find there are:
   * a large URL collection [http://resource.tcl.tk/resource/]
   * and as part of that, a catalog of extensions [http://resource.tcl.tk/resource/software/extensions/]
   * bulletin boards [http://resource.tcl.tk/bboard/]

Access is open to anyone, adding/maintaining entries requires a simple login so the identity of contributors can be established.

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See also [Where to store information and programs] and [places to find Tcl binaries and sources].

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