Titles people note a lot are:
Paint.net
The Gimp
Does anyone know of a good online photo editor (similar to photoshop or better) that can crop, adjust, contort, flip, or possibly morph images? I need this tool for my research. Or a cheap software I can buy to accomplish this?
Thank you

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic