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.

WWW Tools and Utilities
Tcl-based web servers, applets, and other assorted tools.

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.

FTP Library Package for Tcl/Tk
Provides client side of the File Transfer Protocol (FTP).

Apache Tcl - mod dtcl
An Open Source implementation of server parsed Tcl, running under Apache. It allows you to tightly integrate HTML with Tcl.