A cross-platform GUI library
jEdit is a programmer's text editor written in Java.
This is a port of the ebe programming environment to QT.
Cross Platform GUI Toolkit
Free SLOC counts physical lines of code (SLOC) for many languages
Color picker dialog for Tkinter, alternative to tkinter.colorchooser
Electronic design and programming tools suite like Eagle, MpLab
A Simple GUI Implementation of the Simplex Algorithm
Official software to make beads, mosaic or pencil art easily
A Logo interpreter and programming environment specialized for schools
A Lua and XML Graphical User Interface