OpenStack is an open source cloud computing platform that aims to be simple to implement and massively scalable for both public and private clouds. Since its inception four years ago, OpenStack has grown significantly in adoption and community involvement. The community now includes over 2,000 contributors from 139 countries. Key trends include the maturity of OpenStack use cases in industries like financial services, increased stability, and a focus on the operational experience. Superusers, individuals transforming their organizations with OpenStack, are highlighted for their contributions. The OpenStack user groups portal is introduced to connect the growing number of local user groups.