| API | Description | Category | Date |
|---|---|---|---|
| CarJam | New Zealand car facts history service | Reference | 2008-12-27 |
| CarQuery | Automobile information | Reference | 2011-11-19 |
| CatalogWS | Academic library | Reference | 2008-02-07 |
| CDYNE 411 | Directory assistance service | Reference | 2010-11-19 |
| CDYNE Demographics | Neighborhood level demographics service | Reference | 2010-11-22 |
| CEERN | Conservation and Environment Resource Database | Reference | 2011-02-08 |
| Cevir Turkish-English Dictionary | Turkish-English Dictionary look up service | Reference | 2010-12-02 |
| Chemcaster | Cheminformatics management platform | Reference | 2009-11-29 |
| ChemSpider | Chemical structure database | Science | 2011-12-05 |
| China Historical GIS | Chinese history and geography information service | Reference | 2012-01-17 |
| Chronicling America | Archive of US newspapers | News | 2009-10-22 |
| CitedIn | PubMed citation tracking service | Search | 2011-11-08 |
| CiteULike | Citation management service | Reference | 2011-11-08 |
| City and State by Zip Code | Address lookup service | Reference | 2006-11-19 |
| CityGroups | Local public directory | Reference | 2011-09-13 |
| CKAN | Comprehensive Knowledge Archive Network | Reference | 2010-10-20 |
| ClinicalTrials.gov | Clinical trials database and registry | Medical | 2011-07-26 |
| Complexity Intelligence Spell Checker | Spelling correction and recommendation service | Reference | 2010-11-11 |
| Comprehensive Knowledge Archive Network | Community driven open knowledge database | Reference | 2008-07-10 |
| Conversions | Online calculator and measurment converter | Reference | 2010-01-14 |
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