This project is actively maintained
User documentation (for an early standalone version of this software) is here
It is part of the ODK 2.0 Android tools suite. User documentation for each ODK 2.0 release is under here
The Google group for user questions is: opendatakit@
It is a services APK that provides sensor management services for sensor drivers.
The developer wiki (including release notes) and issues tracker are located under the opendatakit project.
The Google group for software engineering questions is: opendatakit-developers@