Corner-A has released PhotoStyler 4.5 for Mac OS X (http://corner-a.com/photostyler). This new version brings an improved user interface based on the customers feedback.
PhotoStyler offers a way to style digital photos with your Mac. It supports all image formats that are supported by Mac OS X, including RAW images, and uses your GPU to process the photos wherever possible.
PhotoStyler requires Mac OS X 10.5 or higher. It’s Universal Binary so runs natively on PowerPC and Intel Macs. It costs US$30.