os x 10.9 mavericks

The configuration list can install OS X 10.9 Mavericks
mac os x 10.9 mavericks is currently in beta with the first version of developer preview 1, it still has many bugs and some software is not compatible so it cannot run.
Free upgrade guide to OS X Mavericks
other notable additions on the mavericks include the shared links feature in the safari browser, which makes browsing news faster, maps maps brought from ios to many improvements and the ability to sync perfectly with the iphone. / ipad / ipod touch and finally the ibooks application first appeared