What are some alternatives?
When comparing SolusVM and Proxmox Virtual Environment, you can also consider the following products
Virtualizor - Virtualizor is a powerful web based VPS Control Panel.
oVirt - oVirt is a virtualization management application.
VMmanager - VMmanager is a virtualization management software, which presents a perfect tool for creating virtual machines, providing VPS services and building cloud infrastructure.
Xen Orchestra - A complete web UI for controlling a XenServer or Xen infrastructure.
OpenStack - OpenStack software controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API.
WebVirtMgr - WebVirtMgr is a libvirt-based Web interface for managing virtual machines.