cdctl is a program similar to eject. Like eject, it can eject your CD-ROM/DVD drive, but it does a whole lot more. Cdctl provides a user interface to the 2.2 kernel's uniform cdrom driver's ioctl calls, and most 2.0 cdrom drivers (ide-cd and scsi). Cdctl is also capable of doing everything a regular console cd player can as well as drive capability interrogation, autoeject setting, maximum/mininum speed cap setting, disc-changer disc selection, disc status readback, MCN querying, table of contents header readback, track header readback, and much more.
pingx is utility that uses the XNoOp(3x) call to see how fast your connection to your X server is. Wonder whether your X performance is slower in a SSH tunnel? pingx can give you hard numbers so you can find out. It has an option to print out some details about the X server as well. It's also useful to see if a destination X server is up so you can fire up x2x or similar applications intelligently.