comScore is an internet analytics company providing marketing data and analytics to many of the world's largest enterprises, agencies, and publishers.
WhatRunsWhere is a popular competitive intelligence platform for online and mobile media buying.It allows the users to know where their competitors are advertising and what kind of ads they are using. It also provides the users with information like which advertisers and ads are running on a particular domain.
AdClarity is a media intelligence solution for advertising professionals to uncover advertiser, mediator, and publisher online strategies.
Mixrank is a competitive intelligence research tool for media buying that uses machine learning algorithms and predictive modeling to automatically identify the most effective ads and traffic sources.