Most contributions to opensource happen on company time atleast in my experience. I don't code much outside of work yet have plenty of OSS contributions because

Most contributions to opensource happen on company time atleast in my experience. I don't code much outside of work yet have plenty of OSS contributions because in the course of my work I discover bugs, desire new features, etc. All the best developers in these circumstances will atleast attempt to get their changes merged so they don't have to carry patches.