Best Open source projects in Erlang/OTP for learning

Question

I am new to Erlang and wondering what the best open source projects are out there with good documentation. I completed reading both the books Erlang Programming (Francesco) and Programming Erlang (Joe). From what I can see ErlyWeb (Yariv's web framework) and Mochiweb seems to have good documentation. Given my basic knowledge, are there any projects with good documentation where I can dive in and understand the code. Any tips/suggestions are welcome!

Answer 1

The RabbitMq project is very instructional for learning erlang.

Answer 2

I take inspiration from ejabberd and YAWS myself.

Answer 3

ejabberd, YAWS, CouchDB, RabbitMQ, all are awesome! But can a single person (ambitious and quick learner) dig deep and understand the guts of the system written by master craftsmen.