Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computing, Oracle Enterprise Linux JeOS (OEL JeOS), an opensource JeOS project, aims at making it easy to create software appliances. OEL JeOS includes a pre-packaged, small-footprint Oracle Enterprise Linux (OEL) image (either OEL 4.7 or OEL 5.2) for x86 and x86-64, along with a script to customize the image. This results in a freely re-distributable OS-image designed to work with Oracle VM virtualization.