| API | Description | Category | Date |
|---|---|---|---|
| Cortera | Business information and research data | Reference | 2008-05-01 |
| Cortera Business Vitals | Basic company information web service | Reference | 2008-05-11 |
| CrossRef DOI Resolver | Persistent identifier resolver | Reference | 2011-10-11 |
| CrunchBase | Directory of companies, people, and investors | Reference | 2008-07-16 |
| CSRHUB | Corporate Social Responsibility ratings database | Reference | 2011-09-26 |
| D&B Direct | Commercial business information service | Reference | 2011-10-07 |
| Datahotell | Norway open government data | Government | 2011-10-25 |
| Datanibble | Quotes generator | Reference | 2008-12-01 |
| DBpedia | Structured query interface to Wikipedia | Wiki | 2007-08-08 |
| DBpedia Spotlight | Semantic Text Annotation and Disambiguation | Reference | 2011-08-22 |
| Death Index | Access to the Social Security Death Index | Reference | 2009-09-15 |
| Deduktiv ebaas distance | UK postcodes service | Reference | 2011-02-28 |
| Deepdyve | Scientific and medical journals | Reference | 2009-11-19 |
| Dictionary Definitions | Online dictionary | Reference | 2010-01-28 |
| DigitalNZ | New Zealand metadata database | Reference | 2009-09-02 |
| Dun and Bradstreet Business Verification | Research company background data | Reference | 2006-09-23 |
| Dun and Bradstreet Credit Check | Credit quick check web service | Financial | 2006-12-13 |
| Dun and Bradstreet WorldBase Marketing Plus | Business research services | Reference | 2006-09-23 |
| DuoShare Address Verification | US address verification service | Reference | 2008-09-21 |
| eBibleicious | Bible lookup service | Reference | 2011-08-12 |
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