Geyser really nails it for donation-based crowdfunding. Their numbers aren't yet that large, but the UX is pretty good, and it is attracting new projects at the rate of a couple per day. It's metrics seem to be gathering steam.

Donors can be anonymous (via accountless methods, i.e., pay from any LN wallet to the project's Lightning Address provided by Geyser, or pay an LN invoice, or even pay on-chain), or donors can first authenticate which will credit them in the project's Contributors list as well as on the Leaderboard.