Calligra Active is a Calligra interface tailored specifically for use with Plasma Active on tablet devices. Read more about the first release at http://www.shantanutushar.com/content/calligra-now-active
Started off as a generic QML UI for Calligra in January 2011, Calligra Active now aims to provide a basic Office viewer for the Plasma Active project. The source code resides inside the active/ subdirectory of the Calligra repository at https://projects.kde.org/projects/calligra/repository
Even though officially a part of the Calligra suite, Calligra Active follows the release schedule from the Plasma Active project and contributions should be made according to the same.