Ruby is the script language that uses Ruby on Rails web framework. I you want to learn Ruby on Rails you should learn first Ruby. In this list I will add the most important.
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IronRuby is a .NET implementation of the Ruby programming language. We are building a high-quality implementation of Ruby, with excellent performance and seamless integration with .NET libraries and infrastructure. We are targeting compatibility with the 1.8.x branch of Ruby modulo continuations.
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Rubinius is a project to develop the next generation virtual machine for the Ruby programming language.