On OS X, I use those applications: Mellel, Montage, Mariner Calc, Omnigraffle and iWork. I don't see NeoOffice or OpenOffice as a real option - it's too much a MS Office clone.
On Windows, well, I don't know. Stay with MS Office, I'd say. I don't think there is anything better for that platform available.
On Windows, well, I don't know. Stay with MS Office, I'd say. I don't think there is anything better for that platform available.