There are some relatively famous projects that are sponsored by large companies, but then an extremely long tail of lesser known projects that don't have a corp

There are some relatively famous projects that are sponsored by large companies, but then an extremely long tail of lesser known projects that don't have a corporate benefactor and are developed collaboratively by small dev shops, freelancers and volunteers. I've been involved in the FOSS world for 15 years, and can't remember ever working with, or receiving patches from a large corporation. I think large corps generally think they can dominate the landscape, and are therefore less likely to adopt the more collaborative approach inherent to FOSS.