- ISRG/LetsEncrypt: it's amazing how much if an impact they are having in HTTPS, and that's with a very small number of people and resources.

- PHP Foundation.

- Drupal Association - I started my career with Drupal. Although I rarely use Drupal anymore, it feels right.

I wish I could donate to uBlock Origin, but the developer doesn't seem to accept donations last time I checked.

I think the Open Street Map is also well worth donating, I'm going to pretty soon.