They mention in the post that they have a list of official clients you can choose to donate to.
So, if there’s a client you use every day and that you love, consider finding it’s author in our list of official clients, and sending them a little something instead (or too).
It would probably be helpful if they included a link to that list in the post, though it is just one click from the projects homepage, and made it clearer that the list does include at least some subset of third-party clients. Though it would also be reasonable to infer that from the quote.