All our packages are MIT-licensed. But if you use our stuff and want to make us happy, we highly appreciate a postcard from your hometown. This suggestion is mentioned in all readme's of our packages

We've been asking for postcards for quite some time now and have built up a nice collection. Today, we published a new page on our company website that lists all our received cards.

If you like what we are doing in regards to opensource, please send us a postcard too. Our address:

Spatie Samberstraat 69D 2060 Antwerp Belgium

Thanks!

https://spatie.be/en/opensource/postcards