Open Data Kit (ODK) is a free and open-source set of tools which help organizations author, field, and manage mobile data collection solutions. ODK provides an out-of-the-box solution for users to:
Build a data collection form or survey, collect the data on a mobile device and send it to a server, and aggregate the collected data on a server and extract it in useful formats.
In addition to socio-economic and health surveys with GPS locations and images, ODK is being used to create decision support for clinicians and for building multimedia-rich nature mapping tools.
List of agencies deploying ODK: http://opendatakit.org/about/deployments/
Video: http://youtu.be/lo8LaFFSkV8
Key features
Collect a variety of form data types: text, location, photos, video, audio, and barcodes
Provides a ready to deploy online repository to store, view and export collected data
Enables users to generate forms using a drag-and-drop form designer
