What are some alternatives?
Yandex.Direct - Yandex.Direct is an advertising service for placing contextual ads on Yandex.
WordStream - WordStream offers a suite of products to help companies with their SEO and SEM initiatives.
Kenshoo - Kenshoo provides marketing software and empower marketers with technology to build brands and generate demand across all media.
Bing Ads - Bing Ads provides pay per click advertising on both the Bing and Yahoo! search engines.
Conductor - Conductor lets businesses manage their web presence, allowing them to engage and retain customers.
QuanticMind - Managed Search Engine Marketing and Advertising Platform