What distributed process registries are available for Erlang?

Question

I\'d like to compile a reasonably complete list of distributed process registry libraries for Erlang.

Such libraries need to support basic operations like register

Answer 1

Locker is used in several projects at wooga for registering processes.

Riak PG is a "work in progress" alternative to pg2. The source code also serves as a nice example of how to use riak_core.