There are some organisations that handle paperwork for many open source projects. You can donate to these and mark you donations for specific projects or toward

There are some organisations that handle paperwork for many open source projects. You can donate to these and mark you donations for specific projects or towards "overhead". The two I've donated to are Software in the Public Interest ( https://www.spi-inc.org/ https://www.spi-inc.org/ ) The Software Conservancy ( https://sfconservancy.org/ https://sfconservancy.org/ )