Nice to find Kiwix again. Shameless plug, I made my own Kiwix alternative for macOS: https://github.com/technusm1/kiwings
I'll throw in my own shameless plug: Self-host your Stack Overflow, Wikipedia etc on Sandstorm: https://apps.sandstorm.io/app/5uh349d0kky2zp5whrh2znahn27gwh... Obviously uses kiwix-serve as well. 3 years old, I need to make a better clip for updating it.
There's a fund:
https://opencollective.com/sandstormcommunity
The bigger it gets, the more time can be diverted toward it. I was recently paid to upgrade the Etherpad app. But in theory it could go toward core development (which wouldn't be me).