A cross-platform GUI library
wxWidgets is a C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. It has popular language bindings for Python, Perl, Ruby and many other languages, and unlike other cross-platform toolkits, wxWidgets gives 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.
NetEmul is a program for simulating computer networks. It makes possible to build, configure networks and verify its availability. This program allows beginners to see a principles of operation CN and gives a scope for experiments.
Third Party Solution for Qt library (http://trolltech.com) Project of prog.org forum (http://prog.org.ru/forum/forum_14.html)
The purpose of wxSSL is to allow wxWindows programmers to write SSL programs using socket classes similar to what exists in the current wxWindows. wxSSL will implement the IPC and socket classes over SSL.