Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
wxWidgets - wxWidgets: Cross-Platform GUI Library
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
Electron - Build cross platform desktop apps with web technologies
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.