Linux
Ubuntu
Loved by developers and trusted by enterprises. Ubuntu is the first pick for organizations to support their software infrastructure and the OS chosen by 66% of experienced developers.
Linux Mint
A community-driven Linux distribution based on
Ubuntu, bundled with a variety of free and open-source applications. It can provide full out-of-the-box multimedia support for those who choose to include proprietary software such as multimedia codecs.
CentOS
Community-driven free software effort focused around the goal of providing a rich base platform for open source communities to build upon.
Distro Watch
Put the fun back into computing. Use Linux, BSD. Your best source for *.ISO’s to virtualize.