tcl - Tool command language.

Tcl (Tool Command Language) is a very powerful but easy to learn
dynamic programming language, suitable for a very wide range of
uses, including web and desktop applications, networking,
administration, testing and many more.  Open source and
business-friendly, Tcl is a mature yet evolving language
that is truly cross platform, easily deployed and highly
extensible.

For more information, visit:
http://www.tcl.tk