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wcf
This repo contains the client-oriented WCF libraries that enable applications built on .NET Core to communicate with WCF services.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
WCF is now open source (see github) and works well on .Net core and above. If you configure it with nettcpbinding the performance is on par with gRPC. Self-hosting the service works as before via System.ServiceModel.ServiceHost.
The ongoing .net core port called CoreWcf plans to realize that goal as a future feature on it's roadmap. Where there's plans on adding new transports that didn't exist on .net framework wcf like Grpc, Azure Service bus, Amazon SQS, rabbitmq etc...
If you have a need to still support existing client apps that used a WCF backend then this or SoapCore are both options but I don’t think they have full support for all features that WCF had.