Openbay is not easy to install because of the lack of documentation and sphinxsearch which is unknown for many people (like me). I bet there are crazy admins who wants to install Openbay on a FreeBSD server. So I wrote a full tutorial to install it with isohunt's centralized database (Option 1), or with a local one (Option, the hardcore mode).
This tutorial has been tested on FreeBSD 10.1 amd64 with jails. I use mysql56 and php56 because they are available in the ports but older versions should work (php54 or php55). You can use mariadb if you want.
Note: Unfortunately, it's not possible to install the the packages with "pkg install" because some options are missing (for example the php lack the pdo-mysql and mbstring support). You have to work this the ports, that means build everything.