A C++ based toolkit that is primarily used to create nice graphics and GUIs. From their Home Page:
wxWidgets is a C++ library that lets developers create applications for Windows, OS X, Linux and UNIX on 32-bit and 64-bit architectures as well as several mobile platforms including Windows Mobile, iPhone SDK and embedded GTK+.It has popular language bindings for Python, Perl, Ruby and many other languages. Unlike other cross-platform toolkits, wxWidgets gives its applications a truly native look and feel because it uses the platform's native API rather than emulating the GUI. It's also extensive, free, open-source and mature. Why not give it a try?
One thing that this summary didn't mention is that there are more than GUI classes. There are classes that help with networking as well as many other whistles and bells. If you feel you need help there is a forum. You can also buy the book at Amazon or Amazon.uk. For more documentation, examples, tutorials, visit Wiki Page