OpenStack is a free and open-source software platform for cloud computing, mostly deployed as infrastructure-as-a-service (IaaS), whereby virtual servers and other resources are made available to customers.
License: Open Source
OpenStack is a powerful cloud management platform designed for large-scale deployments, offering extensive features and flexibility, while Proxmox Virtual Environment is a more lightweight solution focused on ease of use and management, making it suitable for small to medium-sized environments.