In this talk, we survey some existing literature in mechanism design that has applications to the problem of donor coordination. We will formalise this setting as a public goods market, and note connections to the problem of participatory budgeting, and of designing probabilistic voting rules. We then discuss some solution concepts (such as welfare maximisation, Nash equilibrium, Lindahl equilibrium, and the core), as well as desirable axioms that an allocation rule should satisfy. While there are some promising rules available, there are also strong impossibility theorems implying that all reasonable rules can be manipulated by free-riders.