Treehouse - Treehouse is an award-winning online platform that teaches people how to code.
Gitea - A painless self-hosted Git service
edX - Best Courses. Top Institutions. Learn anytime, anywhere.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
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GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.