Eagle CAD schematic and board and solid models for the Adjacent Reality Tracker
The schematic and board were created in Eagle CAD 6.0 (I know, not open source, but we are pragmatists).
Right now, in the SolidModels directory, there is just a basic enclosure for Tracker revision 0.2. It is available in a parametric OpenSCAD file and an STL that was generated from it.