The git repositories aren't open, but there is not much ongoing development, and it's still interesting to look at it, since it is an interface for Calligra (and poppler) based on yet another ui framework.
So far, Calligra has the following user interfaces:
* Desktop: based on QWidget.
* Calligra Mobile, formerly FreOffice: also based on QWidget, with some Maemo specific parts. This is also what is running on Android, and this gui supports editing both on Maemo and on Android.
* Harmattan Office: based on the MeegoTouch Framework (QGraphicsView)
* Calligra Active: based on QML.
Then there's also another QML-based interface for Calligra that KO GmbH developed internally for MeeGo as an experiment.