I liked this post about how open is Erlang/OTP as a development project. Being open is not only about having a free software or open source license, it is also about the way of managing the development process and the interactions inside the community.
According to that post, Erlang lacks a public development repository, a public bug tracker, and internal library documentation in order to be completely open.
I agree and would add a new thing that is lacking: an Erlang Foundation (similar to, for example, the Gnome Foundation) acting as an umbrella for coordinating all the efforts (projects, conferences, hackfests, tools, regional communities, marketing) and the different actors (users, developers and companies) cooperating around Erlang.
In other words: converting the Erlang language and platform in the “Erlang free software project”.