Indeed it is, it's an open-source photoshop "replacement." I put it in quotes because I'm not very fond of it. Just google it and download it and have fun experimenting. It's not lame at all, I still use TGF1's graphics editor for most of my art.
Downloading now! In the past 48 hours I think I have downloaded 10 new programs so I could start making new games or other fun things! Good stuff though.