This is a great overview about the two interpreters! However, I think you're being a bit inaccurate about how flexible the Rubinius VM is. It is certainly mor

This is a great overview about the two interpreters! However, I think you're being a bit inaccurate about how flexible the Rubinius VM is. It is certainly more than flexible enough to support a wide variety of non-Ruby languages. The core Rubinius team bas been working towards a language-agnostic core, and toolchains for building your own language on top of the Rubinius VM. See http://rubini.us/2011/02/17/rubinius-what-s-next/#multi-language-ualization http://rubini.us/2011/02/17/rubinius-what-s-next/#multi-lang... and http://rubini.us/2011/02/23/introduction-to-fancy/ http://rubini.us/2011/02/23/introduction-to-fancy/ There are already a good number of language projects that build upon it: http://rubini.us/projects/ http://rubini.us/projects/ Fancy is one of the more mature languages built on it (and it's self-hosted): https://github.com/bakkdoor/fancy https://github.com/bakkdoor/fancy. There's even an (immature) Python that runs on top of it: https://github.com/vic/typhon https://github.com/vic/typhon.