reverbAR from Reverb'air on Vimeo.
The tool includes the following features:-
- Ability to track multiple markers.
- Analysis of markers with precision, which can not be confused.
- The black outline of the marker may be relatively thin.
- Multi-platform (PC, iPhone, and soon for Mac).
Coming Soon. (Hopefully, the ShiVa plugin store will be open shortly!)
More info, plus a demo can be found here.