Ruby DSL (Domain Specific Language) repositories, examples

Question

I am seeking excellent examples of Ruby DSLs (Domain Specific Languages). Which repositories, projects do you know of that are worth a read? Why is it (or: are they) great

Answer 1

In the area of Behaviour-Driven Development you can check out:

• Cucumber - Describe BDD using scenarios
• RSpec - Replace testing code with specifying behaviours.

Though I have to admit the RSpec code leaves me scratching my head sometimes because I'm still very much a novice.