Blender is as far as I can tell one the best run and marketed Open Source projects out there. They seem to have a great way to pay for development. They are have a lot of industry invested in their success. They have a great focus on the end power user.
They got $1.2M from Epics megagrant last year, and has lots of people and companies donating. They are slightly above the goal of funding 20 full time employees. I'm happy that an open source software have been so successful. It's come very far since when I first used it, version 2.42 I think. Shoutout to those donating (and how to contribute): https://fund.blender.org/
Blender was difficult to learn, but it was a lot of fun and thankfully the community was extremely helpful with tutorials and what not. When NaN (the company that developed Blender) went belly up in the early 00's I like many others had absolutely zero confidence that Ton and gang would be able to raise the $100k to buy out the IP from the venture capitalists who'd invested in NaN, only to then give it away for free and open source to boot.
It sounded absolutely mad, and I'm overjoyed that Ton and gang managed to prove doubters like myself wrong. Here's to hopefully many more years of success!