Alternatives to PS subscription services?

What are the alternatives to Adobe's subscription services?

Old version of Photoshop, if so is there a legal way to obtain the software?

Other software but also the advantages/disadvantages. For instance Gimp.

Suggestions?

Marty, here you go.

http://www.largeformatphotography.in...ight=photoshop

http://www.largeformatphotography.in...ight=photoshop

And there's more, search "Photoshop" or "CS6".