(pronounced Jay Boss) is an open source
based application server
. Because it is Java based, JBoss can be used on any operating system that supports Java. It is open source, but a company (also named JBoss) creates it. The company has a tech consultation service, but the consultants spend half of their time programming.
JBoss implements the entire J2EE suite of services.
The Sims Online uses JBoss to run its multiplayer games.