Khan Academy – Great for those who know Scratch and are ready for more depth.
Free Code Camp – The best place to start for brand-new coders.
Crunchzilla – Simple and concise walkthroughs for ages preteen through adult, with few additional resources.
Hackety Hack – Downloadable software for creating simple user-interfaces with Ruby. Several introductory lessons are available.
Code Academy (Ruby) -Interactive walkthroughs, which allow users to start coding immediately. Fun and engaging.
Ruby Quick Reference – An easy way to look up parts of Ruby to get more information.