Exponential has debuted a powerful new ad server it says publishers can use for free, reports ClickZ.

The Expo9 server served approximately 20 to 25 billion ads per month during its beta testing period. Ads have been delivered to sites in the Tribal Fusion Network, of which Exponential is the parent. The Expo9 interface allows advertisers to target and place ads where they feel they're performing the best.

By allowing for third-party integration, Exponential hopes its system can become a one-stop shop for publishers to manage all the ads on their site or sites.

The new system, the company says, is a marked step over its previous ad server offerings because of its extensive targeting capabilities.