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.
Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
isEazy - Cloud-based eLearning course authoring tool
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
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.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.