AnyCable WebSocket Servers
Since AnyCable uses gRPC to "speak" with the Ruby application, it could be used with any WebSocket server which implements AnyCable gRPC client.
Since v1.0 the only officially supported (i.e., recommended for production usage) server is anycable-go
(written in Golang).
For older versions you can still use erlycable
(Erlang).
We also have a server written in Ruby–AnyCable Rack Server–which could be used for local experiments to emulate the same architecture as with real AnyCable server.
See the demo of how you can use anycable-rack-server to run system tests.
If you're not happy with the above implementations, you can build your own AnyCable-compatible server.