Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
NWEA Assessments - NWEA Assessments creates a personalized assessment experience by adapting to each student's learning level.
Flarum - Flarum is the next-generation forum software that makes online discussion fun. It's simple, fast, and free.
ALEKS - ALEKS is a web-based artificially intelligent assessment and learning system that uses adaptive questioning to accurately determine exactly student knows.
Simple Machines Forum - Simple Machines offers free open source software such as SMF, the powerful and easy to use community forum written in PHP. Start interesting discussions on your website!
iSpring QuizMaker - iSpring Quiz Maker is easy-to-use quiz software. Create interactive quizzes and surveys in HTML5 & Flash and embed them in a website or publish for any LMS!