Here is a collection of alternatives to dominant platforms & tools. My personal priority here is avoiding my data being tracked/harvested/exploited, supporting artists much more directly, and boycotting companies with ties to Israel and the military industrial complex. This is not intended to be a purely FOSS list, but carries a bit of that philosophy. Very interested in efforts by collectively owned companies, fair labour agreements, and genuine non-profits.
⭐ = I use this / have tested it enough to vouch for
Additional resources