A curated list of the books about Ruby programming language

Free

Ruby Is For Fun by Roman Pushkin

Free

Ruby one-liners cookboock by Sundeep Agarwal

Free

Ruby Notes for Professionals by GoalKicker Books

Free

Ruby для романтиков by Роман Пушкин

Design Patterns in Ruby by Russ Olsen

99 Bottles of OOP by Sandi Metz

Самоучитель Ruby by Игорь Симдянов

Learn Enough Ruby by Michael Hartl

The Well-Grounded Rubyist by David A.Black, Joseph Leo III

Effective Ruby by Peter J. Jones

Jesus Castello Ruby Deep Dive

Ruby Deep Dive by Jesus Castello

Practical Object-Oriented Design by Sandi Metz

Comprehensive Ruby Programming by Jordan Hudgens

Head First Ruby by Jay McGavren

The Ruby Way by Hal Fulton, André Arko

Free

Nicholas Johnson The Ruby Book

The Ruby Book by Nicholas Johnson

Metapgrogramming Ruby 2 by Paolo Perrotta

Programming Ruby 1.9 & 2.0 by Chad Fowler

Eloquent Ruby by Russ Olsen