dash-The code you never found in books

Sometimes you know what to do but need the API documents to get exactly the code structure. The normal way is go to its website and find for the API. But there is application called Dash which stores 150+ offline documentation sets. You can find anything you need in 1 search box, fast and offline. For OSX and iOS user you can use Dash, for other system there is another alternative apps called Zeal