looking for a business planning software for mac

I’ve been looking for a business planning software for mac, but not
like Omni softwares. I need a simple one that is just like Business
Pro ’07 for Windows. I have iBook G4 that has not Intel, so I can not
use any Windows software… All I need is to write a simple Business
plan and calculation to forecast revenues and costs. Please
recommend me something or give me some suggestion. Thanks