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
Connect2id's Java SDK
- Golang RP and TA
- Java TA implementation - NIKHEF, Jouke Roorda