besides google adsense, is there any other site that has the same service? sell ads on your site pay per click

besides google adsense, is there any other site that has the same service? sell ads on your site with pay per click system?
google adsense is a program that allows webmasters to put ads on their website and earn money as the visitors visit the sponsors, my question is , is there any other program like that in other websites?

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