MatPIV is a toolbox for Particle Image Velocimetry, made to run with MATLAB (by the Mathworks Inc). By using MATLAB as a foundation, MatPIV is practically platform independent, meaning that the code will run on any platform where MATLAB will run. MatPIV is supplied with source code under the terms of the GNU general public license manager (see below) which means that it is straightforward to write additions or to do personal modifications to the code.
http://www.math.uio.no/%7Ejks/matpiv/