wxWidgets - wxWidgets: Cross-Platform GUI Library
Headjack - Create VR video apps in minutes
Electron - Build cross platform desktop apps with web technologies
Contentful - You don't need another CMS. You need a better way to manage content — unified, structured, and ready to deploy to any digital channel.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
UniteAR - An augmented reality application for android.