VMD is a molecular visualization program for displaying, animating, and analyzing large biomolecular systems using 3-D graphics and built-in scripting.
Qt is a cross-platform application development framework, widely used for the development of GUI programs, and also used for developing non-GUI programs such as console tools and servers.
Qt uses C++ with several non-standard extensions implemented by an additional pre-processor that generates standard C++ code before compilation.
Subversion (SVN) is a version control system. It is used to maintain current and historical versions of files such as source code, web pages, and documentation. The goal of the Subversion project is to build a version control system that is a compelling replacement for CVS in the open source community. The software is released under an Apache/BSD-style open source license