I worked on a slide deck we were proposing SD Cards & Thumb drives preloaded with Kiwix and an almost full almost localized version of Khanh Academy (KA Lite at the time) which could be mass distributed in active conflict zones where the schools and education were some of the first casualties. I don't think it ever went too far which was a shame compared to how other monies were spent at the time these could have really made a difference.

Yeah, Kiwix is great! I have that on my phone to browse when I'm on airplanes.

HERE WeGo also has offline maps (although you have to download them prior to being offline).

Useful for when I have been traveling and need GPS nav and there isn't cell service.