This project is actively maintained
User documentation for each ODK 2.0 release is under here
The Google group for user questions is: opendatakit@
It is part of the ODK 2.0 Android tools suite.
This contains a collection of sensor drivers that perform various data collection tasks.
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@