The Akka mailing list is where the Akka community meets. Asking and answering questions on the mailing list is a great way to share knowledge about Akka.
The akka/akka gitter channel is available for ad-hoc discussions of all things Akka-related with the community and the Akka team.
Stack Overflow is a Q&A site for programmers. Stack Overflow has a very active community of people asking and answering questions about Akka.
Bug reports help Akka improve, so please report any issues you have! Akka uses GitHub to track issues.
Akka's code and documentation is hosted on Github. It's easy to get the code and build Akka from source.
Create your own features on top of Akka, Akka HTTP or Akka Streams. Tag the project on Scaladex to get listed.