The navX MXP Github repository is at https://github.com/kauailabs/navxmxp.

This repository includes:

- navX MXP firmware source code (C, C++) and project files for Eclipse
- navX MXP hardware schematics/layout files (Eagle PCB 6.5 format)
- navX MXP Tools source code (C#)
- navX MXP UI source code (Processing)
- navX MXP Setup Program (Innosetup)

For more information please also see the online guide to the sources in the "Advanced" section at http://navx-mxp.kauailabs.com.