Even though Varnish may not be in fashion any more, there were many companies happily using it for free and still demanding security updates.

I like their transparency about who actually supports them, and what the whole community gets for it. I wish other projects would do that, if for no other reason than to make it obvious that FOSS isn't just something that happens.

https://phk.freebsd.dk/VML/2025/

Also sponsorship of community conferences/meetups for OSS software.