wxWidgets is an open source cross-platform GUI toolkit, with ports for Linux/Unix (GTK+, X11, Motif, MGL), Windows, Windows Mobile, Mac OS X, and OS/2. You can write wxWidgets applications in several languages including C++, Python, C#, Ruby, and Perl. Thousands of commercial and non-commercial organizations rely on wxWidgets; notable applications include Audacity, OSAF's Chandler, Juice, AVG Antivirus, Forte Agent, and BitWise IM. Recently, wxWidgets user Robert J. Lang was featured on Apple's front page for his work on origami software using wxWidgets.