BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Treehouse - Treehouse is an award-winning online platform that teaches people how to code.
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
edX - Best Courses. Top Institutions. Learn anytime, anywhere.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Pantheon - The professional website platform for Drupal & WordPress sites.