FutureLearn - Free online courses from top universities and cultural institutions
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
Free Code Camp - Learn to code by helping nonprofits.
Nifty - Manage projects, work, and communications in one place.
Mindvalley - Mindvalley is an online education platform that facilitates users by connecting them with numerous strong-minded people worldwide and sharing knowledge or ideas through chatting, meetups, and video calls.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.