Sponsoring Open Source Developers
I am nowhere near their numbers, but I run a boostrapped business that would never be possible if it wasn't for Clojure (and specifically ClojureScript). A while ago I decided that I'd be permanently setting aside a percentage of revenue that will go towards sponsoring open-source developers that write and maintain libraries that my project uses. The contributions are very small, but growing steadily.I think what matters mostly is not the contribution size, but the mindset. If every company using open source contributed at least a little, we would have a healthy ecosystem.