Tk is a GUI toolkit for Tcl.
See Tcl project for releases and mailing lists.
http://sourceforge.net/projects/tcl/
Bug reports to http://core.tcl.tk/tk/
Follow code development at http://core.tcl.tk/tk/
Everyday Software for the Researcher of Restricted Means: This project is intended to offer scientists and students with small budgets advanced versions of aqua-built desktop-editing, graphics and statistical applications for MacOSX.
Realtime 3D game/visualization engine, written in C++, scriptable through Tcl/Tk, Python and Lua. Supports D3D and OpenGL for rendering, runs under Linux and Windows.