The list of Identity Providers available to eduID.at Service Providers can be found here:

https://eduid.at/entities/idp

The subset of these Identity Proiders also participating in eduGAIN (i.e., that can access Service Providers registered in other federations):

https://eduid.at/entities/idp/edugain


The list of Identity Providers available to eduID.at Service Providers (also) participating in Interfederation (i.e., Identity Providers from eduID.at as well as from other federations):

https://eduid.at/entities/idp/interfed

Documentation