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Review of DevDocs powered by the Slant community.
DevDocs is written in Ruby and operated by freeCodeCamp.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free and open source
Pro Works offline
In order to works offline, all you had to do is install the DevDocs browser extension.
Pro Download what you need
DevDocs comes with the major documentation, but you can download a lot more if you need it.