If you didn't already suggest it, I would have suggested Veloren!
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Yep, what's promising about Veloren is I feel like everyone had a pretty cohesive idea of what Cube World was "going to be". It's pretty hard to disappoint a community when the developers are the community.
For me it's CDDA, a quite realistic and deep apocalyptic survival game with very frequent updates(on the experimental branch)
[https://spacestation14.io/](Space Station 14)
Arguable if you can call it a game or not, but there is Overte. It is an open-source social VR platform. (without crypto so please no pitchforks)
As one of its developers I might be biased, but I wouldn't be one of the developers if I didn't honestly believe in the project.