I've used a lot of Python in my career, and Effbot's work was a huge boost on much that I did. ElementTree was a boon when I was building an RSS reader, and PIL was a go to tool for image work.

There has been a lot written recently about "open source being broken", and it's true that the financial model doesn't always work out. But someone like Fredrik who gave so much freely to the community was able to impact people far and wide in a positive way. RIP