Comment by MrCoffee7

I would suggest Hammunition, https://github.com/Renegade-Penguin/Hammunition with install docs at https://renegade-penguin.github.io/Hammunition/ . Hammunition offers much more info than Nomad for SHTF type emergencies. Hammunition uses KIWIX tools instead of an LLM to search the reference sources that you downloaded (eg. Wikipedia, etc.). You can install it on a Linux distro on a 500 GB external SSD drive that you can pick up for $100 at Microcenter. It is geared toward people interested in ham radio, but you can listen only on the ham radio bands without a ham license.