For the Icehouse release, over 120 different organizations contributed to development with 1,202 different developers all contributing code. While there is a broad base of contribution, 80 percent of the code commits were written by 21 percent of the developers that contributed to Icehouse.
From a corporate perspective, Red Hat committed more code than any other organization toward the OpenStack Icehouse release, at 16.71 percent of total number of code comitts. For the OpenStack Havana release six months ago, Red Hat contributed 16.6 percent of the code changes. Rounding out the top five contributors overall to OpenStack Icehouse development were IBM, HP, Rackspace and Mirantis.