WordStream - WordStream offers a suite of products to help companies with their SEO and SEM initiatives.
BuySellAds - BuySellAds.com Online Advertising Network
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Tiny Marketing Wins - Get a (small) marketing tip every day
Marin Software - Optimize your Search, Social & Display ads across channels and devices. Marin Software, the leading cross-channel performance advertising platform.
Needls. - By monitoring social media ads in real time, needls. is able to continuously optimize the ads to target new business. Cross platform optimization allows needls. to assess when client ads are most effective.