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Donation platform
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
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.