Jak IrfanView tak XnView jsou hodne kvalitni programy. Ale obavam se ze jsou free jenom pro soukrome ucely.
http://www.irfanview.com/IrfanView is provided as freeware, but only for private, non-commercial use (that means at home).
http://perso.wanadoo.fr/pierre.g/xnview/enxnview.ht mlXnView & NConvert are provided as Freeware for private non-commercial, educational use and non-profit organization.