Proxmox Virtual Environment is described as 'Complete and easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines. Proxmox VE tightly integrates KVM hypervisor and LXC containers, software-defined storage and networking functionality on a single' and is a very popular Virtualization tool in the backup & sync category. There are more than 25 alternatives to Proxmox Virtual Environment for a variety of platforms, including Linux, Self-Hosted, Web-based, Windows and Mac apps. The best Proxmox Virtual Environment alternative is VirtualBox, which is both free and Open Source. Other great apps like Proxmox Virtual Environment are XCP-ng, OpenStack, VMware vSphere Hypervisor and SmartOS.
Open source VirtualBox offers powerful x86/AMD64 virtualization available freely under GNU GPL v2. Runs on Windows, Linux, Mac, Solaris hosts. Supports a vast array of guest OS like Windows, Linux, Solaris. Portable, lightweight, ad-free, with dark mode.
Server based hypervisor and desktop hypervisor are not the same
It is a Type 2 Hypervisor, not Type 1.
XCP-ng is a high-performance, enterprise-level hypervisor with a rich ecosystem and is the result of massive cooperation between individuals and companies. All commercial features are enabled with no commitment required to a support agreement.
Works like Citrix hypervisor, and could be managed for free by XCP console for many platforms and you may adopt Xen Orchestra for automation and WEB management (freemium also). Both products came from same company so it works seamlessly.
OpenStack OpenStack is a global collaboration of developers and cloud computing technologists producing the ubiquitous open source cloud computing platform for public and private clouds. The project aims to deliver solutions for all types of clouds by being simple to implement...
Openstack is for global companies, this solution is too expensive compare to Proxmox. Openstack is googd alternative to VMware vCloud Director for example.
VMware vSphere Hypervisor ( based on ESXi ) is a free bare-metal hypervisor that virtualizes servers so you can consolidate your applications on less hardware.
SmartOS is a hypervisor lean enough to run entirely in memory, powerful enough to run as much as you want to throw at it. Provisioning is blindingly fast, thanks to zones and ZFS file system creation.
Linux-based web control panel for automated KVM virtual machine management, cloud and VPS deployment, modern user interface, load monitoring every 15 minutes, weekly security updates, billing integrations, flexible pricing, and feature-unlimited free trial for 30 days.
The open version is heavily crippled compared to proxmox's open feature set
Microsoft Hyper-V Server is a free product that delivers enterprise-class virtualization for your datacenter and hybrid cloud.
Centrally manage your virtual infrastructure with VMware vCenter Server, server management software for your virtual infrastructure.
oVirt is a virtualization management application. That means that you can use the oVirt management interface ( the oVirt engine) to manage hardware nodes, storage and network resources, and to deploy and monitor virtual machines running in your data center.
Fully featured, actively developed, good high availability featureset
VMware virtualizes computing, from the data center to the cloud to mobile devices, to help our customers be more agile, responsive, and profitable.
(formerly XenServer) Citrix Hypervisor is a leading virtualization management platform optimized for application, desktop and server virtualization infrastructures.
Harvester is the next generation of open-source hyperconverged infrastructure solutions designed for modern cloud-native environments.
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Use cases have practically no overlap. Proxmox requires dedicated server hardware and is of no use to casual users with desktops, whereas VirtualBox is controlled manually with a GUI and would be highly inconvenient and inefficient for the kind of infrastructure Proxmox is designed for