LibEngsas is a c++ library, which uses Qt-Framework and provides some enhancements. Therefore the hidden usage of KDE is one of the most important topics in LibEngsas. The goal is, to give the programmer a common API, regardless KDE is internally used or not. As an example, EFileDialog is a replacement for QFileDialog, which automatically uses KFileDialog internally, if LibEngsas is build against KDE and QFileDialog if not.
Further information can be found at https://trac.engsas.de/libengsas