Liberapay: a non-profit and open-source recurrent donations platform
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GIMP: https://liberapay.com/GIMP/
Mastodon: https://liberapay.com/Mastodon/
Matrix: https://liberapay.com/matrixdotorg/
Syncthing: https://liberapay.com/Syncthing/
Wireguard: https://liberapay.com/WireGuard/
Liberapay doesn't charge any fees, so they ask for support on their own platform: https://liberapay.com/Liberapay/