Dash

Dash 4.6.7 | Mac OS X | 14 MB. 

Dash is an API Documentation Browser and Code Snippet Manager. Dash stores snippets of code and instantly searches offline documentation sets for 200+ APIs, 100+ cheat sheets and more. You can even generate your own docsets or request docsets to be included.

Compatibility: OS X 10.10 or later 64-bit
Homepage: https://kapeli.com/dash