I got DBvis to connect via jdbc to oracle 8.1.7.
I've been going through the SQL commands in the Oracle University textbook and so far every single row function I've tried works as it should.
One word of caution. Do not say yes to the question "Should I reference all the tables" when you are on the Reference tab connected to oracle. 11,000+ tables takes too long to display.

Summarize:
DBvis connects well for
PostgreSQL on SuSE 7.3
VFP DBF on Win2K
Oracle on Win2K

I plan to get a connect to a VFP DBF free table in SuSE this weekend.
JLK