Series: API Design Best Practices (by MuleSoft)

MuleSoft is very well known in the API space and I personally have used and promoted RAML and is usually compared with Swagger (2.0).  These series of posts from them will be very useful for anyone delving into RESTful APIs.

API design best practices series

• Part 1: Planning Your API 
• Part 2: Spec Driven Development 
• Part 3: Nouns, CRUD, and More 
• Part 4: Hypermedia 
• Continue Reading on Hypermedia 

I will keep updating this post as and when MuleSoft publishes theirs.

HATEOAS, REST, and Hypermedia Primer

HATEOAS, REST, and Hypermedia Primer with Mat Velloso

RESTFrameworks - implementing-rest

Exploring the implementation aspects of the REST architectural style.
List of known frameworks that have REST aspects 

NOTE: If you are an author/advocate of a framework listed here, feel free to contribute to the wiki to improve the accuracy of the data. If you know of a REST-ful framework/library that is not listed here, contact one of the project members to add it to the list.

Its been a while since this has been updated, so this could just be for informational purposes.