UNIX-based DBMS wanted

[Henjum]

I would like to able to get a copy of UNIX-based DBMS for the 3B1/7300
that is NOT the Smart Database Manager.

I have seen references to DBASE III in this newsgroup.
Is this version under UNIX or does it require the DOS-73 board?
Are there any other good DBMS out there that run ON UNIX?

Thanks in advance for whatever help you can provide.

   -- Olaf Henjum (att!ihlpf!olaf)