VMware (under Broadcom) is the enterprise virtualization and multi-cloud platform leader offering vSphere, NSX, vSAN, Horizon, and VMware Cloud to power enterprise private and multi-cloud architectures.
Vagrant, released by HashiCorp in 2010 and headquartered in San Francisco, defines reproducible VM dev environments via Vagrantfile with multiple providers and automated provisioning.
Cockpit is a Red Hat-sponsored open-source web server management console (LGPL v2.1+) supporting Fedora, RHEL, Debian and Ubuntu, offering free management of system services, storage, networking, VMs and containers.
Citrix is a global leader in virtualization, VDI, and DaaS, now a brand under Cloud Software Group, offering Citrix DaaS, Citrix Virtual Apps, Citrix ADC, and enterprise computing solutions.