The "source" links on the HDR Fox T2 page all go to the same place and are not necessarily the source code for the packages as delivered now. It's just a copy of the original at some point in time, not updated, and not really a huge amount of use.
For the Foxsat, I don't know. You'd have to ask the original developers, most of whom have disappeared.
Maybe if you explained exactly what you wanted them for and what you were actually trying to achieve...