DiFX is a suite of programs which allow the correlation of interferometric baseband radio data. It is designed to run on in a cluster computing environment, and uses MPI to enable parallel processing. DiFX has been compiled and tested on numerous Linux distributions, and should run on any 32 or 64 bit Linux machine with a 2.6+ kernel. DiFX is described in detail in Deller, Tingay, Bailes & West 2007, PASP, 119, 318 and Deller et al., 2011.
DiFX is freely available - for more information on how to obtain, install, and run the code, please visit https://www.atnf.csiro.au/vlbi/dokuwiki/doku.php/difx/documentation and also sign up at the mailing list there.