FutureLearn - Free online courses from top universities and cultural institutions
Codefield - Tools for developers, designers and photographers
Free Code Camp - Learn to code by helping nonprofits.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
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.
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.