A wxWidgets GUI Builder
A free C, C++ and Fortran IDE
Window Maker Live Linux Distribution
Python module to build dialogs for terminal-based applications
Zoomable user interface (ZUI) with file manager, file viewers and more
A Python wrapper library for the cross-platform FLTK GUI library.
A visual front end to git
an OSGi-based Swing Application Framework
Use Qt write lunar calendar.
An open process control and laser engraving software solution
gnoga - The GNU Omnificent GUI for Ada
Library of widgets for Motif/Lesstif.
Portable User-Interface Framework
Tools to create and run scripts managing special kind of windows
Collection of utility functions
Objective-C embedded development libraries
Web and Mobile framework
Java UI Framework for Desktop/iOS/Android
JUL Designer - a RAD tool for JavaScript