VirtualBox isn't really an admin tool, but it does allow administrators to do solid sandbox testing before deploying a piece of software or a platform. With this tool, you can load up an OS, tweak it, break it, and fix it.
Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website jackwallen.com.