http://www.myfreephotoplus.com photoplus 5 is for free.
http://www.dogwaffle.com/cyberop.htm
http://www.vicman.net/vcwphoto
http://www.zoner.com/draw3/overview.asp
http://www.hotfreeware.com/2020/2020.htm
In any case i preffer PaintShopPro over Photoshop, is very easy to use, have a decent filters, and the menu-mouse is not Apple-mac-like such Photoshop. Gimp have a strange interface.. it have many effects but is not really worth for many works.
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"Cuando se es peon, la unica salida es la revolución"