Widgets??? What and Why
- wxWidgets — Free, extensible, cross-platform UI toolkit with a dockable user interface extension
- Juce — An extensive cross-platform UI toolkit
- FLTK — A light, cross platform, non-native widget toolkit
- FOX toolkit — A fast, open source, cross-platform widget toolkit
- FrugalWidgets - A minimalistic widget set for Win32
- GTK+ — The GIMP toolkit, a widget toolkit used by GNOME applications
- IUP_(software) -- IUP cross platform static/dynamic library C/Lua, Lua (MIT) licence
- JX Application Framework
- Microsoft Foundation Classes - The most commonly used widgeting toolkit for Windows.
- Motif
- Object Windows Library & OWLNext
- Qt — A widget toolkit used by KDE
- Standard Widget Toolkit — SWT for Java
- Swing — Java widget toolkit
- Tk — Toolkit part of the Tcl - project and often used by Perl and Python programmers
- Ultimate++
- Visual Component Library
- XForms