First Steps With Ruby
An introduction to Ruby for beginners. It discusses installation of Ruby and writing your first simple script.
Learn to Program
By Chris Pine. Engaging beginner introduction to programming, via Ruby. Not only for Ruby newbies. Code examples are live, running input and output, as a constant quality check. Teaches one concept at a time. [Open Content]
Learning Ruby
By Daniel Carrera. Introduces programming, Ruby, assumes familiarity with computers in Unix X Terminal environment, but not Ruby; simple descriptions, many screenshots. Unfinished, but well done and useful for what is done.
Ruby Documentation Project
Links and downloads for Ruby programming documentation.
Ruby Embedded into C++
Describes how to embed Ruby interpreter in C++, gives skeleton to build on, treats concepts of embedding, advanced topics like SWIG. Descriptions, code, diagrams, links, news.
Ruby User's Guide
Original Japanese version by matz. First English translation by GOTO Kentaro and Julian Fondren. Further translation and editing by Mark Slagell.
The Ruby Programming Language - Welcome
Introduction in Ruby langauge, including history, features, sample programs, resources, and bibliography.
Things That Newcomers to Ruby Should Know
By Bill Tjokroaminata. List of most common 'gotchas' in this language, in HTML, text. Table of contents, descriptions, code samples, links.