Ad Chain Optimizer - Consolidates statistics from various ad networks to generate reports and charts comparing performance.

Adchemy - Seems oriented towards advertisers only.

AdXPose - Owned by mPire.

ADlinkr - Seems oriented to services for ad networks.

AdMeld - Oriented to "premium" publishers working with multiple ad networks and exchanges.

AdOcean

Adometry

AdPerfect

AdReady

AdSafe Media - Oriented to protecting brands by avoiding ad displays near undesireable content.

Anchor Intelligence - Includes targeting, revenue optimization, and click fraud detection.

AppNexus

Atlas Solutions - Owned by Microsoft Advertising.

Audience Science - Formerly known as Revenue Science.

BlueKai - Their data exchange buys and sells behavioral targeting information based on Web site visitor's actions.

Buysight - Previously known as Permuto. Remarketing and scoring of visitors' readiness to convert.

Cadreon

Chango - Retargeting based on search terms used by visitors.

CheckM8 - Ad serving and management.

ChoiceStream

Coremetrics

DigiPath Media

DoubleVerify

DSNR

Dynamic Logic

eBureau - Offers scoring systems to predict the quality of marketing leads, along with credit risk and delinquent collection potential.

eXelate - Helps publishers and advertisers exchange targeting data.

FetchBack - Offers "Retargeting" to display ads based on the visitor's previous viewing of products.

Firstlook

Invite Media

Looksmart

Media Networks, Inc. / MNI - Owned by Time Warner.

Mindset Media - Psychographic measurement and targeting.

Netmining

Networked Insights - Oriented to tools for advertisers on social networking sites.

Peer 39

PerformLine

PubMatic - Offers real-time optimization and filtering.

ReTargeter

Rubicon Project

TACODA - Owned by Platform-A.

TagMan - Oriented to merchants with CPA / Affiliate programs.

TARGUSinfo

Teracent

Tumri

Turn

X+1

YieldBuild

Yieldex