Adobe has basically released their Creative Suite 2 software, including Photoshop, Premiere, Audition, and Illustrator. Admittedly they are currently on CS6, but for those who don't need it for professional reasons (i.e. most of
us), it should do the trick. It's on the official Adobe website, so it's legit.
http://www.adobe.com/downloads/cs2_downloads/index.html?PID=3640929 I love me my open source software, but come on, Photoshop became a verb for a reason.