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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.
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.
Plus the platform would require a cut to cover operating expenses.
More economical (but, yes, more work) to setup separate donations.