Swank is a Tk compatible GUI widget set using Java Swing components. Many existing Tk applications can be run using Swank with little or no modifications.
Æjaks is a server-side web development toolkit using Tk-like components. Applications developed in Æjaks are written in Tcl and require no HTML, Javascript or CSS.
TesTcl is a Tcl library for unit testing iRules which are used when configuring F5 BigIP devices.