| API | Description | Category | Date |
|---|---|---|---|
| Twingly | Blog Search Service | Blogging | 2012-07-26 |
| Unofficial Alexa Rank and Backlink | Check the Alexa rank of any domain | Internet | 2010-12-07 |
| UrlTrends | Link tracking and search optimization | Advertising | 2005-09-08 |
| VeryRelated Mind Maps Keyword | Keywords generation service | Utility | 2010-01-29 |
| VideoBloom | VideoBloom is a leader in end-to-end online video advertising and distribution solutions. | Video | 2008-10-18 |
| WebSEOAnalytics | SEO analytics service | Internet | 2011-08-15 |
| Wordpot | Search engine optimization services | Internet | 2008-10-11 |
| Wordsfinder Keywords Extractor | SEO term extraction service | Internet | 2009-03-10 |
| Wordstream Keyword Tool | Keyword suggestion service | Search | 2010-05-05 |
| wrap.im | Anonymous linking library | Internet | 2010-12-20 |
| Yahoo Site Explorer | Web site analysis service | Internet | 2007-02-01 |
| Yandex Webmaster | Yandex-specific search engine optimization tools | Internet | 2013-02-25 |
| zanox | Internet monetization services | Advertising | 2008-11-15 |
| ZoomRank | SEO rank monitoring service | Internet | 2010-12-17 |
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