| API | Description | Category | Date |
|---|---|---|---|
| VeryRelated Mind Maps Keyword | Keywords generation service | Utility | 2010-01-29 |
| Watson | Semantic web gateway | Internet | 2010-12-20 |
| WebLib HealthMash | Medical semantic search engine | Medical | 2012-08-03 |
| Wikimeta | Semantic tagging and content annotation service | Reference | 2012-02-14 |
| Wolfram Alpha | Computational knowledge and search engine | Reference | 2009-05-16 |
| Wortschatz | German linguistics services | Tools | 2013-05-01 |
| Yahoo Content Analysis | Semantic relevance service | Tools | 2011-12-22 |
| Yahoo Geo Location | Geolocation service for words and phrases | Mapping | 2012-04-23 |
| Yebol | Semantic search engine | Search | 2009-10-20 |
| Yolink | Semantic search | Search | 2010-07-11 |
| Zemanta | Blog authoring extension services | Blogging | 2008-07-20 |
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