Udemy - Online Courses - Learn Anything, On Your Schedule
Twitter Polls - Polls embedded in tweets
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
Curious Polls - Answer a question once a day for the chance to win £100/$100
Adobe Captivate Prime LMS - Adobe Captivate Prime LMS is easy to setup and helps in delivering engaging learning experiences in a personalized manner across devices.
Simple Poll - The easiest way to create polls in Slack