The Linux project (https://www.linux.com/blog/top-10-developers-and-companies-contributing-linux-kernel-2015-2016 https://www.linux.com/blog/top-10-developers-a

The Linux project (https://www.linux.com/blog/top-10-developers-and-companies-contributing-linux-kernel-2015-2016 https://www.linux.com/blog/top-10-developers-and-companies-c...) and Debian (https://wiki.debian.org/Statistics https://wiki.debian.org/Statistics) track a fair amount of data.