What I'd like to encourage people to do here is list favorite applications and extensions built around Tcl.

What do you find yourself either using the most frequently, or using to show someone what Tcl can do?

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[LV]: Of course, number one has to be this [wikit].

I really love [tkinspect] and I find myself most frequently using either [eskil] or [frink] when developing.

I also love the functionality in [teacup].

I just looked through the code in my ~/bin directories. Most of it is
code from this wiki or from the community- the rest are things I've
hacked together over the years.

The most common packages used in the various apps are:
Tk, http, log, various struct modules,
htmlparse, log, Tclx, oratcl, base64, csv, metakit, thread, Tnm, Trf, 
admin, auth, cgi, cmdline, mail, mtype, scripdoc, session, starkit,
as well as a lot of "one time use" type modules.

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[RS] loves most to demonstrate things in an interactive [console], up to [tdom]: my visitors (colleagues) are mostly very impressed how simple it all is, and I then mail them the sample code to use in their scripts :^)

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[JM] I frequently use [tclodbc], [BLT] and [TableList].
I am a fan of [RS]'s [whizzlets]
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[slebetman] loves [Tkcon]. The '''edit''' functionality is a godsend. By now I'm used to doing:
  proc foo {} {};edit foo
when writing/prototyping procs in [tkcon].

Another thing I'm particularly fond of is using [uplevel] to create custom control structures. Something which took me a long time to appreciate. Nowdays I find it hard to resist creating custom control structures to communicate intent -- much better/clearer/more readable than commenting.

And of course there's [tcllib].

And my favourite Tcl extension: [Tk] (the whole reason I got into Tcl in the first place)
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[Category Community]