ChainLink

ChainLink is cross-platform data processing and visualization software that allows full and convenient access to C libraries, classes, functions, and Qt4 Widgets within a Matlab/Scilab/Octave style scripting environment.

While Matlab and the free alternatives to Matlab do provide tools for accessing C/C functions from within scripts, the process is not natural, as the user must provide complex wrappers, converting their data to built-in data types.