The platform that works closest to this is https://www.liberapay.com/

It used to allow making 1 monthly payment and spreading it between projects. But they had to change to comply with banking/payment platform rules so each money transfer is directed to one beneficiary from the get go. Meaning you setup a recurring payment per project.

There's also the nlnet foundation https://nlnet.nl/

It's possible to give them 1 recurring payment to support OSS projects. But they manage how the money is split between projects and their own overhead. You don't pick the projects.

Well, the big issue with that is that all the projects you want to donate to will also have to be on that same platform. If any of them aren't, you'll still have to deal with those ones individually.

I dont think someone would put the effort into it. You can calculate those values yourself:

• Divide 100% into whatever groups you want (60%, 25%, 15%)
• Convert percentages to decimals (move the decimal 2 spots to the left: .6, .25, .15)
• Multiply the decimal with your total amount to get the portion:

25 * .6 = 15

25 * .25 = 6.25

25 * .15 = 3.75

• Chech your work: sum the results together to confirm its the full value:

15 + 6.25 + 3.75 = 25 ☆

It sound great but it's way easier to just put in the IBAN and setup a recurring donation for each project.

I've asked the same question in the past, and see it keep coming up. The lack of something centralised or coordinated for donations is a massive missed opportunity for FOSS.

This is exactly the sort of thing I think the FSF should take on. They are a nonprofit which exists to promote free software, and I think this should include the freedom to donate and receive funds. They are smart people and I'm sure they could figure out how to do it in an efficient way.