VMware is a US virtualisation and cloud infrastructure company, now owned by Broadcom, known for vSphere and private cloud software that runs workloads in data centres.
Nutanix is a US hybrid multicloud software company offering hyperconverged infrastructure, a cloud platform and data services that simplify running applications across data centres and clouds.
Red Hat is an IBM-owned open source software company offering Red Hat Enterprise Linux, OpenShift and Ansible for hybrid cloud, automation and enterprise infrastructure.