LCDproc is a piece of open source software that displays real-time system information from your Linux/*BSD box on a LCD. The server supports several serial and USB devices from Matrix Orbital and CrystalFontz as well as some devices connected to the LPT port: HD44780, T6963, SED1520 and SED1330. Various clients are available that display things like CPU load, system load, memory usage, uptime, and a lot more.