It is an easy one-click installer for Windows, OS X and Linux. They are self-contained and independent so you can install it without modify your system.
You can also download a Virtual Appliance ready-to-run or you can deploy it for free in the Amazon or Azure Cloud.
They ship XOOPS v2.5.5 and dependencies: Apache 2.4.4, PHP 5.4.13 and MySQL 5.5.29.
The main benefit for XOOPS of being in BitNami distribution will be an increased number of choices for users to install XOOPS, and making it easier for them to install XOOPS with one click on various platforms.