Hello group, 

interesting (relatively new) OpenID Connect / OAuth Server in .Net:
https://github.com/IdentityServer/IdentityServer4

Already provides some good documentation - one could borrow some nice explainations from there ;-)
(some parts are still a bit sparse at the moment)
https://identityserver4.readthedocs.io/en/dev/index.html

Such a listing of all supported specs could also be useful for Keycloak docs:
https://identityserver4.readthedocs.io/en/dev/intro/specs.html

Cheers,
Thomas