OpenStack OS developer¬†Piston Cloud Computing¬†announced on Wednesday that it has launched its Piston Enterprise operating system, pentOS, to the general public. OpenStack is the fastest-growing open source project in the world, with over 2,321 contributors and 147 participating companies including Rackspace, NASA, Citrix, Intel, Cisco, AT&T, Arista Networks, Microsoft and Dell. OpenStack is proven and…