GNU Image Manipulation Program (GIMP) is an alternative for Photoshop for Linux as well as for Windows operational systems. I was not fair to skip this image editor in my reviews on this site because most of this site itself was made in GIMP and not in Photoshop. The latest versions of GIMP are getting nicer and nicer featurewise and it is easier to use it from day to day. For those of you who used to work with Photoshop a lot, GIMP may appear a little unconfortable to work with but after  a few weeks of working with it you can see that you can do most of the things that you do in Photoshop but without any payment, because GIMP is free as in FREEdom. So, why not to try it?

Their site is GIMP.org