There's HostingController, Ensim, Plesk, HostingAccelerator, Helm, InsPanel (new), CWIPanel, Hsphere (mixed platform), Command Matrix, and ... wait.. I think that's all for Windows.
Now.. the word of caution.
Visit the websites for these various controllers and see if they have trial/demos, see what kind of support there is... see if they have open forums and read some of the issues people are having. Not all control panels are equal and you could get yourself into a mess going with the wrong one.