The OGo project currently does not provide a native port to FreeBSD, if you are interested in helping with that, please contact us! Please be sure to read the users mailing list archives, quite a lot of people reported instructions on how to get OGo running on FreeBSD.
Of course we appreciate all kind of FreeBSD howto's ;-)
Frank Reppin was so kind to provide a port for OGo: linux-opengroupware 1.0_2.