Visual Tcl is a freely-available, high-quality application development environment for UNIX, Windows, Macintosh and AS400 platforms. Visual Tcl is written entirely in Tcl/Tk and generates pure Tcl/Tk code.
ASED is a Tcl/Tk Editor written in pure Tcl/Tk using the BWidget Toolkit. Features included: multifile editing, syntax-highlighting, command-expansion, undo/redo, autoindent, find/replace, file-browser, help-system
MapServer Workbench is a set of cooperative tools to develop web mapping applications with MapServer. Tools are written in Tcl/Tk, and require the Mapscript scripting interface distributed with MapServer.
Cross Platform Perl Development IDE. Current Alpha is for WIN32 written in Delphi. Initial Plan is too rewrite the IDE in Perl itself.
A win32 and later a multi-platform file editor with it's main emphasis on it's Tcl interface. Still in beta, it manages to deliver a usable, almost fully functional file editor with all the goodies one needs and minus all the goodies not everyone needs. I
Tcl TextEdit is a simple and powerfull texteditor entierly written in tk/tcl scripting language (no compilation required). It aims to be a programming editor.
An editor for wish scripts. Includes an interpreter to test scripts without having to save edits. The interpreter provides a console (regardless of OS) to aid in debugging. Written in pure tcl/tk - no extensions required.
avrLab is an IDE (integrated development environment) for AVR microcontroller from ATMEL. It includes an editor with syntax highlighting. avrLab includes support for macro assembler (tavrasm and avra) as well as support for accessing the AVR via uisp.