Any decent sized Erlang project is implemented this way. Also see Smalltalk, Akka, and the like.

TodoMVC is a clear example.[1] If JS isn't your thing, check out Redux.NET for C# examples, etc.

Basically anything that uses Redux principles.[2] It's how I structure all of my new projects when possible.

[1] https://github.com/reduxjs/redux/tree/master/examples/todomv...

[2] https://redux.js.org/introduction/three-principles