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.
EdApp - EdApp is a multi-award-winning mobile-first learning platform that introduces a better way to train teams anytime, anywhere, on any device.
Slidego - At SlideGo we regard presentation software like Powerpoint as a universal authoring tool.
CourseLab - Free powerful e-learning authoring tool
H5P - H5P is a free and open-source content collaboration framework based on JavaScript.