kerl
Easy building and installing of Erlang/OTP instances
...All is done so that, once a specific release has been built, creating a new installation is as fast as possible. We are supporting the current OTP release version and 2 prior release versions (same as upstream OTP.) Older OTP releases may or may not work. We will advance release support as new releases of OTP become available. Kerl keeps tracks of the releases it downloads, builds and installs, allowing easy installations to new destinations (without complete rebuilding) and easy switches between Erlang/OTP installations. By default, kerl downloads source tarballs from the official repository tags but you can tell kerl to download from the official Erlang website.