As of December 1996, it has only been run on HP and SUN computers. All data is in the same storage projection. At the moment, GOAT assumes Albers projection, with the BC Environment parameters, but this could could be changed. This is not required for GOAT, but makes it much easier to work with.
Most attribute data is in Oracle.
Again, not required, but much of GOAT's flexibility is based on attributes in Oracle. I expect it could take you a couple of hours to install the bits above and get it running reliably, as there are no automated install scripts for it. There may be other bits and pieces which are automatically distributed to BC Environment computers. Setup of all of this is not complicated, and easily done by any competent Unix system administrator.