For the cost of a micro SD card (or a small micro SD for the OS and an inexpensive USB hard drive for actual data storage) and an Orange Pi Zero (about $10), this could also become a low-power headless Wifi access point providing Wikipedia and other offline data to mobile devices, for example in a school or a community center. Kiwix does offer a standalone HTTP server for ZIM files. The same device could also have provisions for local messaging and storing local user data.