Bare Bones System
Barebones systems are computer cases that already contain a motherboard. Most of these system are rather small, and therefore have the motherboard built in, so they can be great if you don't want a big clunky beige box. Sometimes other peripherals are also called "Barebones".
- Asus Pundit (URL)
Quite a few people use this system, be sure you do not get it's newer brother Pundit-R, since not all of the hardware is supported under Linux. See this and this thread.
- Asus Pundit-R - Fully supported with minimal effort using Ubuntu.
- Asus Terminator
- Shuttle XPC M1000
- Shuttle XPC M2000
- Shuttle XPC mini X100
- Msi Mega Pc 180 / 651 / 865 /