I saw an article today about a new Photoshop alternative for Mac users that is currently free in beta form. You just need to sign up with an email address and you get a download link. Once it launches it will be $50 in the App Store. article link: http://petapixel.com/2015/02/09/affinity-photo-new-pro-photoshop-alternative-mac-users-get-free/ Here is a link to sign up for the beta: https://affinity.serif.com/en-gb/photo/ The article linked above has a number of videos that preview the software. I just downloaded it and will update when I have had a chance to try it out for more than 2 minutes. I did try to open an Olympus RAW file and it didn't work, so I think this is meant more for photo editing than RAW processing, at least in the beta version.