I just uploaded a “feature-refresh” of the IdSrv Beta to github.
This includes amongst some bug fixes the ability to use IdSrv as a federation gateway/home realm discovery page. This gives you the ability to use IdSrv to broker trust between multiple external identity providers and relying parties.
I recorded a short video showing off the new features:
In the video I also show how to add support for web identities like Google, LiveID etc to IdSrv by federating with the Azure ACS.