IdentityServer vNext: Duende IdentityServer
IdentityServer has reached such a level of adoption that building and maintaining it has become a considerable effort. The creators, Dominick and Brock, have decided that this is no longer tenable with free/sponsored development. Therefore, they have announced the next version of IdentityServer (Duende IdentityServer) will require a paid for license for commercial use.
Andrew Clymer Oct. 01, 2020