Adserver.Online's answer:
Adserver.Online is a multitool for digital advertising.
Adserver.Online's answer:
Simple configuration, comprehensive knowledge base, reasonable pricing.
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.
Revive Adserver - The free open source ad server formerly known as OpenX Source
Epom - An ad serving solution for publishers, advertisers, ad and affiliate networks
Kevel - Kevel's APIs make it easy for engineers and PMs to quickly launch a fully-customized, white-labeled, server-side ad server.
Google Ad Manager - Grow revenue wherever your users are with an integrated ad management platform that surfaces insights for smarter business decisions.
AdGlare - AdGlare is a scalable Ad Server in the cloud, both for Publishers and Advertisers.