Proxmox develops enterprise-grade open-source server software, with products covering server virtualization (Proxmox VE), data backup (Proxmox Backup Server), email security (Proxmox Mail Gateway), and multi-cluster management (Proxmox Datacenter Manager). Its flagship product, Proxmox VE, integrates KVM virtual machines, LXC container management, software-defined storage, and high-availability clustering into a single web interface, serving as an open-source alternative to VMware vSphere and Microsoft Hyper-V. It runs on over 1.5 million systems across more than 140 countries, and boasts a network of over 225,000 community members and 3,000 integration partners.

Proxmox was founded in Vienna, Austria in 2005 by brothers Martin Maurer and Dietmar Maurer, where its headquarters remain today with a staff of about 53 employees. The company is independent and profitable, with no external investors. Proxmox VE was first released in 2008 and is the world's first platform to integrate the KVM hypervisor and container virtualization into a single management interface. In 2025, the company celebrates its 20th anniversary, with over 1.5 million systems globally powered by Proxmox. The company is also a member of the Linux Foundation and the Open Virtualization Alliance.