Gimp is a nice open source app that could give most of the features that Photoshop does (not all). When comparing both and relating the price tag, gimp is really a good alternative to photoshop. With some tweaks we could make Gimp much similar to photoshop.
If you have got used to photoshop, using both the programs might create some difficulty as the menu structures of both the programs are very much unlike. There are some good plugins and tweaks that could possibly make gimp like photoshop.
So instead of a long video tutorial explaining each and every transformation of gimp to photoshop, here is a video tutorial that will help you in understanding this quickly.
Making Gimp Similar To Photoshop
Have you used this before, comment down your experience?