iSpring Free - iSpring Free is a free eLearning authoring tool that allows you to create responsive courses and quizzes right in PowerPoint and convert them to HTML5 or SCORM.
Open Elearning - Free and open source software for editing courses and educational games easily.
isEazy - Cloud-based eLearning course authoring tool
Slidego - At SlideGo we regard presentation software like Powerpoint as a universal authoring tool.
Crowd Wisdom - Crowd Wisdom is a learning management system that is providing teams to have a better learning environment to grow their business and make things more visible.
H5P - H5P is a free and open-source content collaboration framework based on JavaScript.