DevDocs
http://devdocs.io/

DevDocs combines multiple API documentations in a fast, organized, and searchable interface. Here’s what you should know before you start: 1) To pick your docs, click Select documentation in the bottom left corner;  2) You don’t have to use your mouse — see the list of keyboard shortcuts; 3) The search supports fuzzy matching (e.g. “bgcp” brings up “background-clip”); 4) To search a specific documentation, type its name  (or an abbreviation), then Tab; 5) You can search using your browser’s address bar — learn how; 6) DevDocs works on mobile and is available as a Chrome web app; 7) For the latest news, subscribe to the newsletter or follow @DevDocs; and 8) DevDocs is free and open source. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.