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
DevDocs works on mobile and can be installed on Chrome and Firefox.
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DevDocs is free and open source  
If you like the app, please consider funding the project on Gittip. Thanks!
Sponsored by MaxCDN
That's all. Happy coding!