Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
wxWidgets - wxWidgets: Cross-Platform GUI Library
built.io - Idea to app in record time
Electron - Build cross platform desktop apps with web technologies
Clear Impact Scorecard - Clear Impact Scorecard is a grant management and performance software solution.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.