Free Orbit MFD is a free software clone of Orbiter's built-in Orbit MFD. It has one additional feature: its colors can be customized using a .cfg file.
The sources may be useful to other developers. They contain a copy of KOST (the Kepler Orbit Simulation Toolkit) and some functions that provide Orbiter functionality which is not available through the official Orbiter SDK, such as popup menus.
Version 1.2 uses the new KOST version 0.75, and it also adds the MFD button for setting the HUD reference object.