An open source ad technology platform written in PHP that serves as an alternative to Google's AdSense.
OpenX is an open-source advertising server that is licensed under the GNU General Public License. It features an integrated banner management interface and tracking system for gathering statistics. The product enables web site administrators to rotate banners from both in-house advertisement campaigns as well as from paid or third-party sources, such as Google's AdSense.
OpenX have announced the sale of OpenX Source to the Revive Adserver team.