The very talented people over at Spatie have a cool way to pay them back for their open source work. Postcards.
I recently came across this while looking for a library to create those pesky “Add to calendar” links (a technology that still hasn’t been standardised with schema).
All they ask for in return for using their libraries is that you send them “a postcard from your hometown, mentioning which of our package(s) you are using“. They have a page showcasing the postcards they’ve received on their website which is a nice touch too.