Wikipedia
Sysquake
Sysquake is a numerical computing environment based on a programming language mostly-compatible with MATLAB. It offers facilities for interactive graphics which give insights into the problems being analyzed. It is used in teaching, research, and engineering.
Sysquake supports two kinds of codes: libraries (collections of related functions which extend Sysquake capabilities), and SQ files, applications with interactive graphics which can have their own menus. Sysquake Pro can also be extended with plugins.