Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
wxWidgets - wxWidgets: Cross-Platform GUI Library
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Electron - Build cross platform desktop apps with web technologies
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.