Extension to Tcl/Tk

... There are lots and lots of extensions to Tcl/Tk beyond a basic working version of the interpreter.

Some of those we have used here and found good are:

blt (Bell Labs Tcl) ftp:ftp.aud.alcatel.com/tcl/extensions/BLT-1.7.tar.gz: a few miscellaneous Tk widgets and features, nicely done
tcl-dp (distributed processing Tcl) ftp: tcl-dp3.2.tar.gz: added functionality for interprocess communications, RPC support, etc.
expect (best built as a separate interpreter): a handy tool for automating alpha terminal activity like telnet and ftp
scotty (best built as a separate interpreter): Tcl with major TCP, UDP, ICMP, and SNMP extensions: write your own network management tools easily and quickly
vuw-meters (the "New Zealand widgets") ftp: get it from us: some really nice meter widgets with builtin timers and interrupt service
graph: graphing widget extensions
sybtcl (Sybase extension for Tcl) ftp: sybtcl-2.11.tar.gz: uses Sybase dblib (OpenClient) to permit embedded SQL programming using tcl
tclXess (for the commercial spreadsheet Xess) ftp from AIS: permits "remote control" of spreadsheet, via Xess API; get it from AIS (the Xess people) via FTP or at their web site
nlitcl (for the commercial product Natural Language) ftp: from us

For a long list of cool Tcl/Tk extensions click here