| entity | Comments |
| Auth0 | OAuth 2.0 OpenID Connect Provider |
| Authlete | OAuth 2.0 OpenID Connect Provider |
| AuthMachine | OAuth 2.0 OpenID Connect Provider |
| IdentityServer | OAuth 2.0 OpenID Connect Provider |
| COBH Identity | OAuth 2.0 OpenID Connect Provider |
| Computer Associates API-Gateway | OAuth 2.0 OpenID Connect Provider |
| Chinese Academy of Sciences | OAuth 2.0 OpenID Connect Provider |
| Clareity Security Identity Provider | OAuth 2.0 OpenID Connect Provider |
| ClassLink OneClick | OAuth 2.0OpenID Connect Provider |
| Classmethod Barista | OAuth 2.0OpenID Connect Provider |
| Cloudentity | OAuth 2.0 OpenID Connect Provider |
| Connect2id | OAuth 2.0 OpenID Connect Provider |
| Curity | OAuth 2.0 OpenID Connect Provider |
| mojeID | OAuth 2.0 OpenID Connect Provider |
| ForgeRock OpenAM | OAuth 2.0 OpenID Connect Provider |
| Gluu | OAuth 2.0 OpenID Connect Provider |
| GrabTaxi Holdings Grab ID | OAuth 2.0 OpenID Connect Provider |
| GraviteeSource Access Management | OAuth 2.0 OpenID Connect Provider |
| GSMA Mobile Connect Reference Implementation | OAuth 2.0 OpenID Connect Provider |
| Thierry Habart SimpleIdentityServer | OAuth 2.0 OpenID Connect Provider |
| Hanscan Biocryptology OpenID Identity Server | OAuth 2.0 OpenID Connect Provider |
| pyoidc | OAuth 2.0 OpenID Connect Provider |
| Spark Platform | OAuth 2.0 OpenID Connect Provider |
| Identity Automation RapidIdentity Federation | OAuth 2.0 OpenID Connect Provider |
| i-Sprint Innovations AccessMatrix UAM | OAuth 2.0 OpenID Connect Provider |
| KSign Access | OAuth 2.0 OpenID Connect Provider |
| The Library of Congress Authentication, Authorization, and Accounting System, | OAuth 2.0 OpenID Connect Provider |
| LINE Login | OAuth 2.0 OpenID Connect Provider |
| Mvine Federated Identity Hub | OAuth 2.0 OpenID Connect Provider |
| NEC NC7000-3A-OC | OAuth 2.0 OpenID Connect Provider |
| NextReason Next Reason Central Identity | OAuth 2.0 OpenID Connect Provider |
| Nomura Research Institute | OAuth 2.0 OpenID Connect Provider |
| NRI SecureTechnologies | OAuth 2.0 OpenID Connect Provider |
| NTT Software Corporation TrustBind Federation Manager | OAuth 2.0 OpenID Connect Provider |
| OGIS-RI ThemiStruct Identity Platform | OAuth 2.0 OpenID Connect Provider |
| Okta Okta OP | OAuth 2.0 OpenID Connect Provider |
| Onegini Onegini Connect | OAuth 2.0 OpenID Connect Provider |
| OpenAthens Cloud | OAuth 2.0 OpenID Connect Provider |
| Optimal IdM | OAuth 2.0 OpenID Connect Provider |
| Oracle Oracle Identity Cloud Service | OAuth 2.0 OpenID Connect Provider |
| ORY GmbH ORY Hydra | OAuth 2.0 OpenID Connect Provider |
| Oxyliom GAÏA Trust Platform | OAuth 2.0 OpenID Connect Provider |
| Peercraft ApS | OAuth 2.0 OpenID Connect Provider |
| Ping Identity PingFederate | OAuth 2.0 OpenID Connect Provider |
| Ping Identity PingOne | OAuth 2.0 OpenID Connect Provider |
| Pivotal Cloud Foundry | OAuth 2.0 OpenID Connect Provider |
| Privacy Vaults Online (PRIVO) PRIVO-Lock | OAuth 2.0 OpenID Connect Provider |
| ProSiebenSat.1 Media 7Pass | OAuth 2.0 OpenID Connect Provider |
| Recruit ID | OAuth 2.0 OpenID Connect Provider |
| MITREidConnect | OAuth 2.0 OpenID Connect Provider |
| SecureAuth | OAuth 2.0 OpenID Connect Provider |
| Node.js oidc-provider | OAuth 2.0 OpenID Connect Provider |
| SoftBank | OAuth 2.0 OpenID Connect Provider |
| Symantec | OAuth 2.0 OpenID Connect Provider |
| HelloID | OAuth 2.0 OpenID Connect Provider |
| U2U Consult The Identity Hub | OAuth 2.0 OpenID Connect Provider |
| University of Chicago | OAuth 2.0 OpenID Connect Provider |
| Verimi | OAuth 2.0 OpenID Connect Provider |
| Verizon VZConnect | OAuth 2.0 OpenID Connect Provider |
| Videntity Systems Verify My Identity | OAuth 2.0 OpenID Connect Provider |
| ViewDS Cobalt | OAuth 2.0 OpenID Connect Provider |
| VMware Workspace ONE | OAuth 2.0 OpenID Connect Provider |
| WidasConcepts cidaas | OAuth 2.0 OpenID Connect Provider |
| WSO2 Identity Server | OAuth 2.0 OpenID Connect Provider |
| Bitbucket | OAuth 2.0 |
| Google App Engine | 1.0a, OAuth 2.0 Authorization Server |
| Jive Software | 1.0a, OAuth 2.0 |
| LinkedIn | 1.0a, OAuth 2.0 Authorization Server |
| Salesforce.com | 1.0a, OAuth 2.0 Authorization Server |
| Twitter | 1.0a, OAuth 2.0 |
| Yahoo | 1.0a, OAuth 2.0 |
| Aerobase | OAuth 2.0 |
| Amazon (AWS Cognito) | OAuth 2.0 Authorization Server |
| AOL | OAuth 2.0 |
| Authentiq | OAuth 2.0 |
| Basecamp | OAuth 2.0 |
| Battle.net | OAuth 2.0 |
| bitly | OAuth 2.0 |
| Box | OAuth 2.0 |
| Cloud Foundry | OAuth 2.0 Authorization Server |
| Deutsche Telekom | OAuth 2.0 |
| Discord | OAuth 2.0 |
| Fitbit | OAuth 2.0 |
| Formstack | OAuth 2.0 |
| Foursquare | OAuth 2.0 |
| GitHub | OAuth 2.0 Authorization Server |
| Google | OAuth 2.0 Authorization Server Identity Provider (IDP) |
| Huddle | OAuth 2.0 |
| Imgur | OAuth 2.0 |
| Instagram | OAuth 2.0 |
| Intel Cloud Services | OAuth 2.0 |
| Keycloak | OAuth 2.0 |
| Microsoft (Hotmail, Windows Live, Messenger, Azure, Xbox) | OAuth 2.0 Identity Provider (IDP) Authorization Server |
| OpenAM | OAuth 2.0 |
| Passport | OAuth 2.0 |
| PayPal | OAuth 2.0 |
| Reddit | OAuth 2.0 |
| Sina Weibo | OAuth 2.0 |
| Stack Exchange | OAuth 2.0 |
| Strava | OAuth 2.0 |
| Stripe | OAuth 2.0 |
| Twitch | OAuth 2.0 |
| Ukey1 | OAuth 2.0 |
| Viadeo | OAuth 2.0 |
| VK | OAuth 2.0 |
| XING | OAuth 2.0 |
| Yammer | OAuth 2.0 |
| Yandex | OAuth 2.0 |
| Yelp | OAuth 2.0 |
| Zendesk | OAuth 2.0 |
| Dailymotion | OAuth 2.0 |
| Facebook | OAuth 2.0 |
| deviantART | OAuth 2.0 |