There are a bunch of these... One recently on HN was http://devdocs.io/ http://devdocs.io/ I personally use Dash.app (http://kapeli.com/dash http://kapeli.com/

There are a bunch of these... One recently on HN was http://devdocs.io/ http://devdocs.io/ I personally use Dash.app (http://kapeli.com/dash http://kapeli.com/dash).