with simultaneous releases for windows and mac os. Version 5 added a presentation package which was very easy to use but unfortunately can't read or write PPTs. (I predict PPT compatibility will be the last battleground of Office-alternatives.)
Latest version is Appleworks 6.2.2 - So far I think Mac-only.
Under OS X it seriously rocks (Starts up fast and reads/writes Word&Excel files) and does everything I need for my work.