FTP Library Package for Tcl/Tk
- Provides client side of the File Transfer Protocol (FTP).
- http://tcllib.sourceforge.net/doc/ftp-docs/

Apache Tcl - mod_dtcl
- An Open Source implementation of server parsed Tcl, running under Apache. It allows you to tightly integrate HTML with Tcl.
- http://tcl.apache.org/mod_dtcl/

The Zircon X11 IRC Client
- A X Window interface to internet relay chat written in Tcl/Tk and using the native network communications of Tcl.
- http://catless.ncl.ac.uk/Programs/Zircon/

WWW Tools and Utilities
- Tcl-based web servers, applets, and other assorted tools.
- http://www.demailly.com/~dl/wwwtools.html

cgi.tcl
- CGI support library for Tcl programmers supporting forms, tables, cookies, file upload, plug-ins, JavaScript, Netscape extensions, and debugging and handling CGI errors.
- http://expect.nist.gov/cgi.tcl/