Price = Free
Piwigo is your image gallery script where users can rate pictures, can comment on them as well as find best rated pictures. Users can sort pictures and it becomes quite easy to find pictures related to tags, ratings, category etc. An open source image gallery script and that too at free of cost.
icanhascheezburger became very successful by just making a popular gallery of cats. You can too by taking and refining your area of interest. Who knows you also can be raking millions.
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