Tk

Tk is a platform independent graphics library and engine, although perhaps better described as a widget toolkit. Although maintained by the same company as Tcl, Tk has been modified for use with sundry other languages including Perl, Python and REXX.

• REXX/Tk - Open source - A port of Tk adapted for use with the REXX scripting language.
• SWANK - Tk reimplemented in SWING, allows porting Tk based software to Java - Open source