While VMWare does require a copy of Windows also installed, there are others that do not require Windows to be installed. One of which was called Crossover Office, I think it is called Crossover Linux now. You can find it at
CodeWeavers - Your Home for Windows Compatibility on Mac and Linux
This was a project developed out of an emulation program developed several years ago, and has improved dramatically over the years. I wished I had seen this thread a couple weeks ago as I had heard somethign about they were makiong a major push on supporting graphics type applications but I don't recall where I read it now, otherwise I'd post a link to it.