What are some alternatives?
VertaMedia - VertaMedia is a Supply-Side Platform designed to meet the demand for efficient ad serving technology and high yield optimization.
Google AdSense - Use Google AdSense to make money online by placing ads on your website and YouTube channel. Start monetizing your website with Google AdSense today.
Atlas by Facebook - Atlas by Facebook is an ad serving platform that also offers tools for marketers to serve, manage, track, and measure their campaigns.
OpenX - Ad technology platform available as a hosted service or as an open source download.
PageFair - An ad serving technology for premium publisher and media groups.
Facebook for Business - Facebook Business gives the latest news, advertising tips, best practices and case studies to meet the business goals.