QtitanRibbon 3.1 has been releaseed and available for download! Build fixes all known bugs that were found by users as well as an errors caused because of moving to Qt5. Among other things, this version allows to use Qt layout (based on QLayout) for the arrangement of the elements within the Ribbon Group. Now, it is possible to use standard QBoxLayout, QFormLayout, QGridLayout, and QStackedLayout inside Ribbon Group. Support of Office 2013 will be added in version 3.2, which is scheduled for release within the next month.
http://www.devmachines.com/qtitanribbon-overview.html