Don't Make Me Think - Originally written in 2000, Don't Make Me Think is one of the original books on web design and usability. Although it's been around for a while, the goals and lessons of the book are universal and apply to websites today.
Rationality: From AI to Zombies - How to make good decisions under uncertainty.
Seismic Learning - Ramp faster, hone skills, and personalize coaching. Click here to see how Seismic Learning (formerly known as Lessonly) streamlines learning and coaching.
CS50x - HarvardX (edX) - An introduction to the intellectual enterprises of computer science and the art of programming.
HelloChinese - HelloChinese is the most fun and effective app for beginners to learn Mandarin Chinese.
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.