Tixapps is a suite of development applications that run with Tcl/Tk or Python, using the Tix widget set. Applications currently included in Tixapps are tixinspect (an inspector for Tix/Tk applications), tixdebug (a debugger to work with tixinspect), and tixinfo (an info browser for GNU documentation).
TclTP (pronounced "Tickle-Type") is a preprocessor based on the TCL scripting language. It allows embedding TCL command and and variable expansions in normal text. The result of expansion is inserted in the output. Quoting and escaping work in a similar way as in TCL, using braces and backslashes. A second stage of processing involves hooks defined by the document. This allows arbitrary transformations of processed text before it is written to the output. TclTP is primarily intended for generating complex static documents like Web pages. It is not a mark-up language per se. But you can define your own mark-up and use it in your documents, possibly allowing the production of output in different formats from the same source file.