Distributor of donations?

Does anyone know of a way to distribute donations to multiple open source projects at once? I would like to donate more frequently and broadly but because of the large number of different projects it would be laborious and inefficient to donate small fractions of what I can afford to each of them manually. What would be helpful is a distributor to whom I can say "These are all the people I want want to donate to and here is some money. Please distribute it to them on my behalf."

Does anything like this already exist?