Some projects I support:

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/