Gibt es auch eine OpenStack Alternative?

A few years ago, there was more than one equivalent OpenStack alternative. These included, for example: CloudStack, AzureStackEucalyptus, Nimbus, OpenNebula and vCloud. Today, however, cloud specialists are wondering whether there is even a single serious competitor left. Because OpenStack clearly leads the private cloud market. The current alternatives are Noris Network, Grass-Merkur and Syntax. These also have many years of experience in cloud computing.