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Ubuntu (pronounced "oo-boon-too"), is a free computer operating system based on GNU/Linux for both PC's and servers.
Ubuntu.com
Fedora is a free Linux-based operating system sponsored by Red Hat.
fedoraproject.orgAn emulator duplicates (emulates) the functions of one system using a different system.
Emulator ZoneVMware: commercial and free desktop for Linux, Windows, and Mac OS X. vmware.com
QEMU: an open source (free) PC emulator for Linux, Windows and MAC OS X. qemu.org
Virtual Box: an open source (free) PC emulator for Linux, Windows and MAC OS X. virtualbox.org
Virtual PC: Microsoft Virtual PC for Windows. virtual pc