| API | Description | Category | Date |
|---|---|---|---|
| Accthub | Account management service | Backend | 2012-05-17 |
| LinuxFr.org | OAuth account authentication service | Backend | 2012-11-26 |
| PSN Sign In | Playstation Network sign in service | Games | 2012-04-24 |
| Aadhaar UIDAI Authentication | Online authentication for Indian citizens | Government | 2011-06-28 |
| FreeYourID | Online identity authentication services | Internet | 2008-08-16 |
| Rackspace Cloud Identity | Cloud services authentication service | Internet | 2011-12-05 |
| PBS Universal User Authentication | User authentication service | Internet | 2012-04-13 |
| eduroam | European internet resource management service | Internet | 2012-06-13 |
| Yahoo BBauth | Browser based authentication service | Security | 2006-10-01 |
| Google Web Authentication | Account authentication proxy for web-based applications | Security | 2006-11-05 |
| Google Client Authentication | Account authentication for installed applications | Security | 2006-11-05 |
| Windows Live ID Client SDK | Windows SDK for Windows Live sign-in authentication | Security | 2007-02-03 |
| Google Single SignOn | Authentication for Google Apps | Security | 2007-02-23 |
| AOL Open Auth | Authentication services | Security | 2007-08-16 |
| Windows Live ID Web Authentication | Web based authentication service | Security | 2008-01-13 |
| Orange Authentication | Authentication service | Security | 2008-03-15 |
| BeenVerified | Authentication services | Security | 2008-05-04 |
| TokBox | Authentication services | Security | 2008-05-26 |
| MyPW Authentication | Authentication services | Security | 2008-12-29 |
| Cumulo Authorize | Authentication services | Security | 2009-01-10 |
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