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Re:Show HN: Zest – FOSS Docs Browser with DevDocs and Stack ... by gravypod on Sunday February 07, 2016 @11:41PM (#11056358)
The local copy of StackOverflow is interesting.

Did they allow this/is this illegal? Is there any precedent for using forum data like this?

Re:Show HN: Zest – FOSS Docs Browser with DevDocs and Stack ... by jkozera on Monday February 08, 2016 @12:46AM (#11056536)
Stack Overflow posts are CC-licensed and all the data is available at https://archive.org/details/stackexchange - this is where Zest downloads it from.

Dash also provides SO search, though only in titles (no full text search).