FreeMat is a free open-source numerical computing environment and programming language,[1] similar to MATLAB and GNU Octave.

[2] In addition to supporting many MATLAB functions and some IDL functionality, it features a codeless interface to external C, C++, and Fortran code, further parallel distributed algorithm development (via MPI), and has plotting and 3D visualization capabilities.

[3] Community support takes place in moderated Google Groups.