wxWidgets - wxWidgets: Cross-Platform GUI Library
Adobe Learning Manager - Adobe Learning Manager (formerly Adobe Captivate Prime LMS) is easy to setup and helps in delivering engaging learning experiences in a personalized manner across devices.
Electron - Build cross platform desktop apps with web technologies
Udemy - Online Courses - Learn Anything, On Your Schedule
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!