On Oracle 10.2 xe Adminer is not able to list all tables. I don't know if this is an issue with table named with '$' or what else, but Adminer lists around 40 tables/views instead of more than a hundred.
The web server is on an old Debian box featuring Instant client middleware, the database runs on windows. Every other tool runs well. Let me know if any other info could be useful or if a test is needed.