Veeam Backup - Backup and restore VMware and Hyper-V virtual machines with Veeam Backup Free Edition. Unlimited hosts and VMs. Free forever.
RHEV - Red Hat Virtualization is an open source, software-defined platform that virtualizes Linux and Microsoft Windows workloads.
Rubrik - Rubrik delivers instant application availability for recovery, search, cloud, and development.
Ubuntu OpenStack - Ubuntu OpenStack is the most trusted and economical way to build your private OpenStack cloud. Supported or fully managed by Canonical.
Zerto - Virtual replication & recovery solution
EMC Avamar - EMC Avamar deduplication backup software and systems provide fast, daily full backups and single-step data recovery.