Halo CMM incorporates an innovative set of technologies that empower local markets to use data assets like panels and exposure events to create measurement reports that are available via a set of Halo APIs. The resulting measurement is intended to meet the needs of the most ambitious advertiser use cases and the demands of media owners for content measurement.
A quick video overview can be found here.
The core technology can be found here.
If you are interested in contributing to the project, see here for how to get started.