The best one is GIMP.
i heard of one and im not sure if i remember the name correctly. AVS? when i googled AVS, all that came up was video editing software. so i googled free photo editing and i have came up with one. but it can not do detail editing, just the whole image. any of them out there that are equal to adobe photoshop?
yeah gimp is fine, there is also a portable version too which you can run off a flash drive.