A lot of the Apache projects came from companies. Although some of these were more like one person at the company developed it and the company funded and maintained it.
Did Kubernetes start in person as in in the same room? It was built by multiple people but I don't know if they shared an office space. I thought it was that they shared a building.
All of the other ones though are pretty solid examples of team-driven OSS work.
A lot of the Apache projects came from companies. Although some of these were more like one person at the company developed it and the company funded and maintained it.