Tcl/Tk

Tcl is an easy-to-learn scripting language which runs on many platforms, including Windows, Linux and MacOS X. Tk is the graphical toolkit for Tcl.

I've been coding in Tcl since mid 2002, or thereabouts, when a friend introduced me to it. Since then I've written an assortment of Tcl programs and scripts, the largest of which is a MUSH client called Potato.

You can download binaries of Tcl/Tk for many platforms from ActiveState's website. You can also find lots of information about Tcl, as well as thousands of programs, scripts and code snippets, on the Tcl Wiki.