| API | Description | Category | Date |
|---|---|---|---|
| SemanticHacker | Semantic discovery service | Search | 2008-03-22 |
| SemanticWire | Semantic news reader service | News | 2011-06-14 |
| Semiocast | Linguistic feed analysis service | Tools | 2012-12-19 |
| Sensebot | Semantic search service | Search | 2009-05-15 |
| Sholarometer | Scholarly resource search service | Search | 2012-03-06 |
| SimilarWeb Website Tagging | Website content tagging service | Internet | 2013-02-26 |
| SISSVoc | Interoperable spatial information service | Mapping | 2012-05-04 |
| smartRealm SNAP | Social network analysis tool | Social | 2010-03-11 |
| Some Murrays Website Summaries | Web site parsing tool | Tools | 2011-10-19 |
| SPIN RDF | SPARQL query processing and translation service | Utility | 2012-03-21 |
| Subj3ct | Semantic Web subject identity resolution service | Other | 2009-08-21 |
| Sumibi | Convert between kanji and romaji | Tools | 2012-12-10 |
| SuperTweet | Twitter analysis, metadata, and monetization services | Social | 2010-03-13 |
| Swoogle | Semantic data search | Tagging | 2008-11-30 |
| Syllabs | Symantic text analysis service | Tools | 2011-04-29 |
| Textpresso for Neuroscience | Neuroscience literature search service | Search | 2012-11-14 |
| True Knowledge | General question and answers service | Search | 2007-12-06 |
| TrustYou Semantic | Semantic Analysis Tool | Tools | 2011-10-10 |
| UMBEL | Semantic structure service | Reference | 2010-11-10 |
| Vapour | Linked data/RDF format validator service | Internet | 2012-07-17 |





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