You can add only the docsets you want to use. Each docset can be assigned an abbreviation, so when you pop up the search field you can search within just a single docset as needed.
You can also set up groups of docsets, also with keyword triggers. You can even have these groups trigger automatically based on the current application or a global keyboard shortcut.
Once you locate the function or documentation you’re looking for, you can keep typing to search within the page. For example, if I type “jq:nextuntil example” it will search the jQuery docset for the nextUntil() function, then jump to the “Example:” section of the page. Basically, it’s all the documentation you need on a hotkey with fully keyboard-based search.
In addition to the ever-present global hotkey, Dash also integrates directly with Xcode, Alfred, QuickSilver, LaunchBar, Sublime Text, Emacs, Vim, Terminal and more.
After a couple of months of playing with Dash, my only wish is that it had snippet import from text files. I keep all my code snippets in text files (and nvALT), and get frustrated with Snippet Managers that can’t read them. Seems like a fair enough request, right?
If you write code – in any language – you should take a look at Dash. There’s a free trial on the App Store, and you can get the full version with an in-app purchase.