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You can use Patreon for that. Evan You has one to fund development of Vue.js

Another successful open source coding Patreon is OctoPrint: https://www.patreon.com/foosel

Oh very cool. So coders do use patreon but they are a minority? Maybe that itself is a good startup idea.

Gratipay (formerly GitTip) used to do that. Not sure how they are doing these days. I haven't heard about them in a while.

We're still here! Check https://gratipay.news/ for what we've been up to. :-)