| API | Description | Category | Date |
|---|---|---|---|
| Aadhaar UIDAI Authentication | Online authentication for Indian citizens | Government | 2011-06-28 |
| AOL Open Auth | Authentication services | Security | 2007-08-16 |
| Apigee OAuth | OAuth authentication across several APIs | Security | 2011-10-07 |
| AT&T Notary Management | Digital signature service | Security | 2012-01-13 |
| Atlassian Crowd | Single Sign On service | Security | 2011-06-24 |
| AuthDog | Authentication creation service | Security | 2011-12-08 |
| BeenVerified | Authentication services | Security | 2008-05-04 |
| Cumulo Authorize | Authentication services | Security | 2009-01-10 |
| DuoFactor | Web authentication service | Security | 2011-09-09 |
| Enole | Mobile Authentication Service | Security | 2010-08-05 |
| FreeYourID | Online identity authentication services | Internet | 2008-08-16 |
| Gigya | Single Sign-In/Registration Service | Social | 2010-12-01 |
| Google Client Authentication | Account authentication for installed applications | Security | 2006-11-05 |
| Google Single SignOn | Authentication for Google Apps | Security | 2007-02-23 |
| Google Web Authentication | Account authentication proxy for web-based applications | Security | 2006-11-05 |
| Kinamik Data Integrity | Tamper evident and digital evidence ready data | Security | 2011-11-01 |
| Lanoba | Website registration and authentication service | Security | 2011-12-13 |
| LiveEnsure | Website and app authentication service | Security | 2011-06-24 |
| MyPW Authentication | Authentication services | Security | 2008-12-29 |
| OpenStack | Authentication for cloud service | Storage | 2011-10-26 |





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