BroApp - Your Clever Relationship Wingman
Alcamy - Free, open self-learning platform. Learn & teach anything.
Giggle - Giggle is a graphical frontend for the git content tracker (think of gitk on GTK+).
Stacks - A bookshelf for your online courses
Self-School - 500+ free courses from the web for you to start learning
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!