Currently we use Spring Boot and Eureka as the Service Registry which comes with tons of useful features like Auto Load Balancers for the services etc. It's intergration is really good if your applications are in Spring ecosystem.
I prototyped Lagom couple of years ago when it was out, its integration with Play! framework was buttery smooth and the best part of Lagom is that it uses highly scalable Akka Actors for communication between Services