What Production-quality implementations of Erlang are there?
• Open Source Erlang is the most popular implementation. It is built from the same source tree as the commercial version of Erlang. You can use Open Source Erlang to build commercial products without having to pay royalties or licence fees to Ericsson. • Ericsson’s Commercial Erlang. This is essentially the same as Open Source Erlang. The main differences are: • Commercial Erlang comes with a support agreement • The OTP team go to greater lengths to test the commercial release, so you get a more stable product. Similarly, they make the transition between versions smoother. • The commercial version includes some encryption-related code which cannot be provided in the open source release for legal reasons. • The commercial release does not contain applications which are considered experimental or unstable.