Originator: NetMesh Inc.
- Several open-source and corporate implementations, most platforms
- Single Sign-On, attribute exchange, authenticated messaging, social functionality...
NetMesh InfoGrid, mylid.net...
Originator: Six Apart Inc.
- Several open-source implementations, most platforms
- Single Sign-On, delegation
Livejournal, Movable Type, myopenid.com, videntity.org...
Originator: Cordance Corp. at al.
- Several open-source and proprietary implementations
- Single Sign-On, attribute exchange, data sharing, introduction forms, link contracts...
Cordance, Ootao, OASIS, xdi.org...