SourceForge http://www.sf.net/ - aka SF - is an ambitious attempt to provide open source projects with freely available source code , bug, and request management, mailing list support, software distribution, and more. The effort has over 20,000 projects at this time.
A number of communities have, in addition, what SF calls Foundries. These are higher level organizational units centered around some theme. The one that is probably of greatest interest to the Tcl community is the Tcl Foundry. From this point, one can find pointers to various SF based projects which have been identified as relating in some way to the Tcl community. However note that there are more Tcl related projects on sourceforge than appear on the foundry front page. A search for tcl will reveal quite a few projects, in case you are looking for applications or extensions that can be tied together via Tcl.
As of mid August, 2001 the massive collaborative project support site at SourceForge [L1 ]/[L2 ] has (at least) 250 projects in (or using) Tcl and Tcl/Tk. Some stay in the top downloads, or high-activity category. This page is started because so many projects have been moving to SF.
Browse these projects from their trove list at:
http://sourceforge.net/softwaremap/trove_list.php?form_cat=182
Free to OpenSource developers, and development collaborators, SourceForge provides:
But rather than advertising SourceForge here, go browse the projects, or start your own, and announce it below:
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etc.
There is also a small code snippets library there:
http://sourceforge.net/snippet/browse.php?by=lang&lang=11