Not a software company, but the cheese board collective in Berkeley seems very interesting. They have survived for a very long time through the pandemic, etc. Impressive.

Not quite an answer either, but one reason for my interest in alternative models of operation is the IETF. It is, and has been a remarkably effective organization. Thanks to them I am typing on my computer at home and sending this out. They do _not_ have members. I understand that they are not a business, but they are more effective than any software company I worked for.

https://www.ietf.org/about/participate/tao/