Awesome Actors'ish
Not only actors, concurrency and distributed programming tools are also listed
.NET
Akka.NET
Azure Functions - Durable Entities
https://docs.microsoft.com/sv-se/azure/azure-functions/durable/durable-functions-dotnet-entities
Azure Service Fabric - Reliable Actors
https://docs.microsoft.com/sv-se/azure/service-fabric/service-fabric-reliable-actors-introduction
Coyote
https://microsoft.github.io/coyote/
F# Mailbox
Project Orleans
https://dotnet.github.io/orleans/