GitHub Classroom - Your course assignments on GitHub
Alcamy - Free, open self-learning platform. Learn & teach anything.
Google Classroom - Learning management tool by Google
Stacks - A bookshelf for your online courses
Peergrade - A student feedback and grading platform
Airschool - Airschool is a live-streaming educational platform with engagement and monetization tools to help anyone start teaching online. It can be finance, business, wellness, meditation, branding, marketing; in short, anything you want!