OpenStack
Open-source cloud infrastructure software.

About OpenStack
In OpenStack’s own words: “OpenStack is an open source cloud computing infrastructure software project and is one of the three most active open source projects in the world.”
OpenStack is open source and is free to use.
People switching from VMware often consider OpenStack.
OpenStack is an alternative to
Similar to OpenStack
- Microsoft Hyper-VVirtualisation built into Windows and Windows Server.

- Nutanix AHVHyperconverged infrastructure with its own hypervisor.

- Proxmox VEOpen-source virtualisation with KVM and LXC.

- Red Hat OpenShiftEnterprise Kubernetes platform.

- VirtualBoxFree, open-source desktop virtualisation.

- XCP-ngOpen-source Xen-based virtualisation platform.

Listed for information; LaunchStall isn’t affiliated with OpenStack. The quoted description comes from openstack.org. Features and plans change — check the official site for current details.
