Comment by d3Xt3r

Plenty. The ones you want to donate to are postmarketOS, Alpine Linux (the distro postmarketOS is based on) and Plasma Mobile (the main DE used by postmarketOS and other distros like Mobian).

In terms of usability, SailfishOS is the most usable, but it has some proprietary components and is commercially backed by Jolla, so there's no need to donate to them. I do encourage you to buy their devices if you can though. Speaking of devices, Furilabs and Volla also make practical, decent spec Linux phones (based on Debian and Ubuntu Touch), so they're worth checking out as well.