It's now possible to sponsor my development work through GitHub Sponsors: github.com/users/thesting. I've currently only added a $5/month tier, but I'll consider adding more. In the short term, this is a good way to contribute money due to GitHub temporarily matching donations.
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GitHub will match 100% of donations during the first year, up to a maximum of $5000. Unfortunately, I don't think this will be a good approach in the long term because GitHub has set it up in a way that they're paying out business income and turning donations into taxable income.
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In Canada, donations supporting my open source work are not usually taxable as long as nothing is provided in exchange for the donation beyond a thank you or basic public credit. GitHub Sponsors conforms to that, but GitHub's involvement is such that it will be taxable income.