VirtualBox is an open source virtualization tool that allows running "guest operatiog systems" from Linux, Windows or Mac O/S.
Instructions for installing VirtualBox on Fedora Linux using 'yum':
Add the file 'virtualbox.repo' to the directory /etc/yum.repos.d/:
[virtualbox]
name=Fedora $releasever - $basearch - VirtualBox
baseurl=http://download.virtualbox.org/virtualbox/rpm/fedora/$releasever/$basearch
enabled=1
gpgcheck=1
gpgkey=http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc
Run 'yum' to remove the previous version and install the new:
yum remove VirtualBox-3.2
yum install VirtualBox-4.0
After installing VirtualBox, install DKMS package to help keep in synch with kernel updates:
yum install dkms
Tips:
VirtualBox preconfigured downloads: