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Rubinius - http://rubini.us/
A next generation virtual machine VM for Ruby, uses best VM and dynamic language implementation research and technology of last 30 years; core libraries are in Ruby, makes system more accessible, easier to develop and extend. Open source, BSD. |
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YARV: Yet Another Ruby VM - http://www.atdot.net/yarv/
Goal: greatly reduce execution time of Ruby programs, be fastest Ruby VM. |
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On Ruby: Ruby Hacker Interview: Kevin Tew - http://on-ruby.blogspot.com/2006/09/ruby-hacker-interview-kevin-tew.html
Kevin Tew, Cardinal creator and project director explains project motives, direction, progress. |
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Cardinal - http://cardinal2.rubyforge.org/
Ruby interpreter for Parrot dynamic multilanguage bytecode VM; links, instructions. |
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MetaRuby: Project Status - http://www.zenspider.com/Languages/Ruby/MetaRuby.html
Goal: implement Ruby's internals in Ruby; will use ruby2c to convert itself to C and bootstrap a new Ruby binary; to be fully compatible with (standard) Ruby. |