| API | Description | Category | Mashups |
|---|---|---|---|
| Google Single SignOn | Authentication for Google Apps | Security | 9 |
| Janrain Engage | Social networking login service | Security | 7 |
| Google Web Authentication | Account authentication proxy for web-based applications | Security | 5 |
| AOL Open Auth | Authentication services | Security | 3 |
| Yahoo BBauth | Browser based authentication service | Security | 3 |
| BioID Web Services | Face and voice biometrics service | Security | 2 |
| TokBox | Authentication services | Security | 2 |
| BeenVerified | Authentication services | Security | 1 |
| FreeYourID | Online identity authentication services | Internet | 1 |
| Gigya | Single Sign-In/Registration Service | Social | 1 |
| Vidoop | Secure authentication service | Security | 1 |
| Aadhaar UIDAI Authentication | Online authentication for Indian citizens | Government | 0 |
| AT&T Notary Management | Digital signature service | Security | 0 |
| Atlassian Crowd | Single Sign On service | Security | 0 |
| Authy | Website and application authentication service | Security | 0 |
| Confident Image-Based Authentication | Image-based authentication service | Security | 0 |
| Duo REST | Two-factor authentication | Security | 0 |
| Duo Verify | Web to mobile user verification | Security | 0 |
| DuoFactor | Web authentication service | Security | 0 |
| eduroam | European internet resource management service | Internet | 0 |
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