QMap is a field data collection application built using QGIS and it's Python plugin system. It was built to be easy to use on (windows) based tablet devices.
Custom forms are built using Qt Designer and follow a convention based approach in order to save configuration.
QMap was orignally built by Southern Downs Regional Council in order to aid in field data collection and is maintained by Nathan at work and in his spare time.
QMap, like QGIS, is Open Sourced under the GPL and can be found on GitHub.
Who doesn't like screenshots?! Find some here. There might even be a video.