The Omni Group has released OmniOutliner 4 for Mac OS X. The upgrade of the outliner sports a new architecture, a fresh design, and more. You can use it to write a novel, take notes at school, keep your scratchpad updated, develop a monthly budget, inventory a collection, even record and store audio from an interview or lecture.

OmniOutliner 4 requires Mac OS X 10.9. It’s a free update for those who’ve purchased the app within the past three years. For new users the price is USs$49.99. For more info go to .