wxWidgets - wxWidgets: Cross-Platform GUI Library
Camunda - The Universal Process Orchestrator
Electron - Build cross platform desktop apps with web technologies
Appian - See how Appian, leading provider of modern low-code and BPM software solutions, has helped transform the businesses of over 3.5 million users worldwide.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Kintone - Build business apps and supercharge your company's productivity with kintone's all-in-one...