Apple yesterday announced the availability of its developer version of its new operating system, Mac OS X 10.8 Mountain Lion Gold Master.
The news comes shortly after Microsoft announced its developer version of Windows 8 will land in August for a general October release.
The full release of Apple's OS is expected for September.
Mountain Lion will bring Siri style dictation to MacBooks, iMacs, and Mac Pros as well as Messages, Notes and Reminders for seamless mobile and desktop integration.
AirPlay Mirroring will be available for matching a computer screen wirelessly with a TV.
US pricing has been set at $US20 ($A19.63).