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Kiwix can do that also. You needs to specify the ZIM file and it works:

Why I know that? I wanted to travel as system administrator in some antartica base with a whole copy of stackoverflow with me.

Nice, how was Antarctica?

Don't forget the Arch and Gentoo wikis!

Kiwix has Stack Overflow (and various StackExchange subsites), Project Gutenberg, TED talks, and plenty more. You can also request something.

Yes, there are Kiwix .zim files of Stack Overflow. I think Zeal also may have an SO docset.