Revive Adserver - The free open source ad server formerly known as OpenX Source
DoubleClick for Publishers - Grow revenue wherever your users are with an integrated ad management platform that surfaces insights for smarter business decisions.
Google Ad Manager - Grow revenue wherever your users are with an integrated ad management platform that surfaces insights for smarter business decisions.
AdHitz - Lets you sell ad space on your site. You choose the details and then paste the code to your site.
Kevel - Kevel's APIs make it easy for engineers and PMs to quickly launch a fully-customized, white-labeled, server-side ad server.
AdSense - Earn money with website monetization from Google AdSense. We'll optimize your ad sizes to give them more chance to be seen and clicked.