The Humble Little Ruby Book – A nicely-written free book on Ruby, by Jeremy McAnally
The Little Book of Ruby – An 87-page free introduction covering Ruby basics.
The Book of Ruby – A 400-page free Ruby bible by Huw Collingbourne.
Programming Ruby – The first edition of the so-called Pickaxe book, available for free, by Dave Thomas, Chad Fowler and Andy Hunt
Why’s (poignant) guide to Ruby – The legendary book by why the lucky stiff. With foxes, little elves, and… chunky bacon!). Exquisitely weird and witty.
Read Ruby 1.9 – “Very early draft of a book about version 1.9 of the Ruby programming language, released under a Creative Commons license.”
Learn Ruby The Hard Way – A Ruby translation of the popular book Learn Python The Hard Way, by Zed Shaw.
All the books mentioned so far are free, but there’s plenty of published books on Ruby. Check out the following titles:
