Comment by karmy

Some of the docs I've had to deal with lately, that I've found very useful and easy to navigate:

https://apidocs.mailchimp.com

https://dashboard.batch.com/doc [Requires Login]

(Great product for marketing push notifications, by the way)

Also Apple has a great doc site. Very verbose, but thorough:

https://developer.apple.com/library/ios/documentation/UIKit/...