The latest version of the RCDevs Identity Provider (ie. RCDevs OpenID product) supports both the OpenID-Connect v1.0 and OAuth2 SSO standards.
The RCDevs identity provider in the previous versions included OpenID v1.1 and v2.0 which is deprecated and has been replaced by OpenID-Connect.
OpenID Connect 1.0 is a simple identity layer on top of the OAuth 2.0 protocol. It allows Clients to verify the identity of the End-User based on the authentication performed by an Authorization Server, as well as to obtain basic profile information about the End-User in an interoperable and REST-like manner.
For more information please contact RCDevs or go to the product page at http://www.rcdevs.com/products/openid-saml-identity-provider/.