Italian implementation (SPID/CIE) - Giuseppe De Marco

• Docs - https://spid-cie-oidc-docs.vercel.app/la_federazione_delle_identita.html

• Federation SDK, written in Python - https://github.com/italia/spid-cie-oidc-django

• OIDC fed over Github pages: https://github.com/peppelinux/oidc-federation-over-gh-pages

• Onboarding system: https://trust-anchor.oidc-federation.online/onboarding/registration/

Roland Hedberg's Fedservice

• Federation example, Python - https://github.com/rohe/fedservice/tree/master/example

Authlete - commercial implementation in Java

• Docs - https://www.authlete.com/developers/oidcfed

• Github - https://github.com/authlete

Connect2id's Java SDK

• Docs - https://connect2id.com/products/nimbus-oauth-openid-connect-sdk/examples/openid-connect/federation

• Bitbucket - https://bitbucket.org/connect2id/oauth-2.0-sdk-with-openid-connect-extensions/src/master/