Velocity1.1.14

Velocity is an offline API documentation viewer that offers quick search into over 150 documentation sets of various languages, frameworks, and APIs. Velocity is a commercial product that is free to download and try.

Some of the documentation sets available include:

ActionScript, Android, AngularJS, Backbone, Bootstrap, C, C++, CoffeeScript, CSS, Dart, Django, Drupal, Go, Haskell, HTML, Java SE, JavaScript, jQuery, Lua, MongoDB, Mono, MySQL, Node.js, Perl, PHP, PostgreSQL, Python, Qt, Redis, Ruby, Ruby on Rails, Scala, SQLite, TypeScript, Underscore.js, Unity 3D, WordPress, Xamarin, Yii, and many more!

Docsets are provided by Dash, the offline documentation viewer for OS X.