Self-Hosting to help a community?
tyler@fedia.io to 
Recently, I've stumbled on more self-hosting projects that help out different communities/groups/non-profits. Examples:
- RIPE Atlas Probe
- Tor Snowflake (or relay)
- Archive Team Warrior
With a hardware investment:
- ADS-B Feeder (need SDR)
- Weather Underground (need weather station)
What else is out there along these lines?
I'm less interested in things like CryptoCurrency nodes or mining (including things like Helium), or very resource-heavy things like Folding@home.
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Iirc signal has something you can host for the communications of strangers.
I know you can set up a self-hosted Signal server, but I'm not aware of any relay/proxy type apps
No, not a server. You can't even use those with the official App iirc
They mean proxies
Signal even made a blog post about it
Help people in Iran reconnect to Signal – a request to our community