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Intertech: Ruby Training
Delivers training in object-oriented programming language that is capturing the attention of developers looking to make improvements in productivity.
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NYCRuby
Group of Ruby and Rails programmers who live and work in the New York City area. Merger of Ruby-NYC and RubyonRails-NYC.
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PLEAC-Ruby
Presents a suite of common programming problems solved in the language.
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The Pragmatic Programmers, LLC: Programming Ruby
Their home base: class reference, articles, tips, software downloads, links, and a zippy looking Ruby slide presentation. Book available as downloadable HTML and XML files.
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Programming Ruby (2nd. Ed.)
Presents details regarding complete descriptions of all 98 standard libraries, 200+ pages of new content, and software entropy.
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Ruby-lang.org
Interpreted, dynamically typed, pure object-oriented, scripting language for fast, easy programming from Japan.