| API | Description | Category | Mashups |
|---|---|---|---|
| Google OpenID | OpenID login for Google account users | Security | 10 |
| Google Single SignOn | Authentication for Google Apps | Security | 9 |
| Google Client Authentication | Account authentication for installed applications | Security | 8 |
| 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 |
| Google Safe Browsing | Security service to verify URLs | Security | 3 |
| PeoplePond | Identity management service | Security | 3 |
| PhishTank | Community site for tracking phishing | Security | 3 |
| Windows Live ID Web Authentication | Web based authentication service | Security | 3 |
| Yahoo BBauth | Browser based authentication service | Security | 3 |
| MyWot | Website reputation service | Security | 2 |
| OneLogin | Single sign-on solution | Security | 2 |
| TokBox | Authentication services | Security | 2 |
| Windows Live Data | Service for users to control data access | Security | 2 |
| BeenVerified | Authentication services | Security | 1 |
| buySAFE | E-commerce trust network | Security | 1 |
| Microsoft HealthVault | Health-related data storage, security, and records | Medical | 1 |
| reCAPTCHA | Security and Book Digitalization Service | Security | 1 |
| TypeKey | Authentication Framework | Security | 1 |





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