| API | Description | Category | Date |
|---|---|---|---|
| Accthub | Account management service | Backend | 2012-05-17 |
| Allyve | Social media integration service | Social | 2012-06-06 |
| AOL Open Auth | Authentication services | Security | 2007-08-16 |
| Apigee OAuth | OAuth authentication across several APIs | Security | 2011-10-07 |
| Atlassian Crowd | Single Sign On service | Security | 2011-06-24 |
| AuthDog | Authentication creation service | Security | 2011-12-08 |
| Authy | Website and application authentication service | Security | 2012-08-08 |
| Cumulo Authorize | Authentication services | Security | 2009-01-10 |
| DailyCred | Social sign in and authentication service | Security | 2012-10-19 |
| Duo REST | Two-factor authentication | Security | 2012-05-01 |
| Duo Verify | Web to mobile user verification | Security | 2012-05-01 |
| Enole | Mobile Authentication Service | Security | 2010-08-05 |
| Gigya | Single Sign-In/Registration Service | Social | 2010-12-01 |
| HP Cloud Identity Service | Cloud identity management service | Security | 2012-04-17 |
| Janrain Engage | Social networking login service | Security | 2008-12-24 |
| Lanoba | Website registration and authentication service | Security | 2011-12-13 |
| LinuxFr.org | OAuth account authentication service | Backend | 2012-11-26 |
| Mozillians | User authentication for Mozilla development community | Security | 2012-12-28 |
| OpenStack | Authentication for cloud service | Storage | 2011-10-26 |
| PBS Universal User Authentication | User authentication service | Internet | 2012-04-13 |





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