Rubinius

Rubinius is an alternative Ruby implementation created by Evan Phoenix. Based loosely on the Smalltalk-80 Blue Book design, Rubinius seeks to "provide a rich, high-performance environment for running Ruby code."

Goals
Rubinius follows in the Lisp and Smalltalk traditions, by natively implementing as much of Ruby as possible in Ruby code.

It also has a goal of being thread-safe in order to be able to embed more than one interpreter in a single application.

Sponsorship
From 2007 to 2013, Engine Yard funded one full-time engineer to work exclusively on Rubinius. Evan Phoenix now works at HashiCorp.

PowerPC64 support
Since version 2.4.0, support on PowerPC64 is enabled.