Is it Open Source: Yes
Link to source tarball/zip file: https://github.com/rethinkdb/rethinkdb/releases
This has sat in accepted for inclusion for over a year. Clearly, there is a lack of demand for the inclusion of this software, nobody has stepped up to provide a patch, maintain it, and properly integrate it. Closing as a result. Feel free to reopen but only when someone offers a patch via our proper patch submission methods and volunteers to be maintainer.