wxWidgets - wxWidgets: Cross-Platform GUI Library
ClassVR - VR Training Simulator
Electron - Build cross platform desktop apps with web technologies
REWO - REWO is a knowledge documentation and distribution solution, which drastically improves capturing, visualizing and communicating knowledge.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Osso VR - Osso VR is a surgical training and assessment platform that allows surgeons, sales teams, and hospital staff to train and assess using advanced virtual reality.