Oracle SQL editor tools
Oracle SQL Developer is free, Java based, graphical and made by Oracle. BUT it is made by Oracle, which should give you a hint about its overall usability (improving over versions, to be fair).
To be able to connect to Oracle 8i, you will need an old version of this tool (has to do with JDBC support, or rather lack of it). Try 1.2.1.
I've always used TOra. Free software (GPL). I've used it on Linux, not sure if it runs on Windows.
They have screenshots if you're interested.