Mandrake and oracle

Hello

I work with windows 2000 and I use "Enterprise Manager with Oracle Tuning Diagnostics and Change Management Packs" basically for top sessions. The database is 8.1.3.7 ( the last release). My question is What cd I neeed to use for do the same things in linux. Where I can download, if I can ?
because I was looking in my cd�s some version of this for linux and I dont find anything. and I think when this version come out There is no version for linux, I�m ok.

Can I use some version from database 9i? the same thing where I can download. I hope you can help me, I really appreciate.

I was looking in oracle site, but theres is only the same cds that I have.
Thanks in advance.

I use mandrake 10.1

Thanks again