Ruby

blade
Site opens with pretty graphic, and otherwise looks thin, but has huge archives of many Ruby mail groups: ruby-list, ruby-dev, ruby-ext, ruby-math, ruby-talk, fj.comp.lang.ruby, comp.lang.ruby, News, News2, Mailing Lists; linux-users.
http://blade.nagaokaut.ac.jp/

Cetus Links: Ruby
Link page: describes language, links to central site, FAQs, references, newsgroup, mailing lists, books.
http://www.cetus-links.org/oo_ruby.html

Comparing and Introducing Ruby
Short introduction to features, compares Ruby to Perl, Python. [PDF]
http://www.nt.ntnu.no/users/haugwarb/Programming/Ruby/ruby_vs_perl_and_python.pdf

Features of Ruby
By Michael Neumann in English and German.
http://www.ntecs.de/old-hp/s-direktnet/ruby_en.html

nycruby
Group of Ruby and Rails programmers who live and work in the New York City area. Merger of ruby-nyc and rubyonrails-nyc.
http://nycruby.org/

PLEAC-Ruby
The Perl Cookbook presents a suite of common programming problems solved in that language. This project aims to gather fans of programming to implement solutions in many other languages. [Open Source]
http://pleac.sourceforge.net/pleac_ruby/

Ralph's Ruby Page
Examples of MS technology being used with open source code. After 10 years with C++, VB, COM and associated MS technologies, Ruby is a lovely breath of fresh air. A few links, software download: Ruby.COM with documentation.
http://www.geocities.com/masonralph/ruby.html

Ruby
Ruby QuickRef, code snippets. MetaRuby project status. Ruby Language audit: 1.0.1. RubyConf 2002-05 schedules and online presentations. Ruby Cookbook. [The Language Freak]
http://www.zenspider.com/Languages/Ruby/

A Ruby a Day
Dedicated site. Shows the things author Brian Schröder is doing with Ruby, has a full Ruby course, simple AI game, quiz solutions.
http://ruby.brian-amberg.de/

Ruby: A Language with a Future
Hal Fulton's Ruby page, small but growing: links, software, and 'Thirty-seven Reasons I Love Ruby'.
http://rubyhacker.com/

Ruby Central, Inc.
Non-profit organization dedicated to promoting growth of open source Ruby programming language; manages RubyConf, donation clearinghouse, presence and point of contact for corporate sponsors.
http://rubycentral.org/

Ruby Code & Style
Peer reviewed online journal: articles, news, Weblogs, buzz, chapters, forums. Artima Software.
http://www.artima.com/rubycs

Ruby Matters
Forum on Ruby language issues, at WordPress.
http://www.rubymatters.com/

Ruby Programming Language
Growing article, with links to many related topics. [Wikipedia]
http://en.wikipedia.org/wiki/Ruby_programming_language

RubyCentral
Ruby resource: One-click Windows installer; online copy of Programming Ruby: The Pragmatic Programmer's Guide. [Open Publication License]
http://www.rubycentral.com/

ruby-talk
Ruby mail list log/archive, powered by Shin-ichiro Hara's Ruby smart archiver.
http://blade.nagaokaut.ac.jp/ruby/ruby-talk/index.shtml

rubyXML
Known as <rubyXML/>: news, articles, and links on XML development with the Ruby scripting language.
http://www.rubyxml.com/

Vista Insight Ruby Directory
Project goal: to be the definitive guide for Ruby programming language and Rails framework; many categories.
http://ruby.vistainsight.com/