In addition to selling econometric software, Laissez Faire Software also performs development work for other economic/econometric firms.  If you would like to discuss your needs in this area, send us an email and we can give you details as to what we can offer.  In the past most of our contract work involved optimization and making modifications to source code or equations so that a particular model would produce the expected results.  We can do this if the model is in Betahat or in another estimation or simulation program.