AdBrite: One of the oldest and more popular advertising network and you can earn money with your website or blog. Unlike other contextual ads networks, AdBrite is specialized in selling ads on your site by a banner on your page. It is very easy to use for everyone, and is completely free!
Bidvertiser: A network of specialists offering contextual advertising and contextual ads as animal feed. It is very similar to Google AdSense. Sample text ads on your site. You do not have enough income, unless you get very good traffic. Best for high-traffic blogs.
Clicksor: One of the most popular advertising networks. They make it possible to earn through various forms of online advertising formats in text ads, contextual advertising, and more. The payments are on net 15 on a schedule for two weeks.
InfoLinks: Mostly links display. It has to be implemented very Eary. Method of payment PayPal, Bank Transfer / ACH, Payoneer Prepaid MasterCard.
Yahoo Publisher Network: Yahoo seeks Google with its own context sensitive advertising to catch service.This a complete copy of the features of Google AdSense. True, this service is available worldwide. If you are in the U.S. are the best alternative to AdSense.