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Google Adwords - https://adwords.google.com/
PPC program where webmasters can create their own ads and choose keywords. |
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Google AdSense - https://www.google.com/adsense/
Offers a contextual advertising solution to web publishers Delivers text-based Google AdWords ads that are relevant to site content pages. |
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ValueClick, Inc. - http://www.valueclick.com/
Provides internet advertising solutions for publishers of web sites and online advertisers, focusing on cost-per-click. |
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http://www.adviva.com/ - http://www.adviva.com/
Online advertising solutions for both web hosts and advertisers, based on the cost per click model for the UK market. |
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BidVertiser - http://www.bidvertiser.com/
Pay per click affiliate program. |