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.
Readwise - Effortlessly rediscover and organize your Kindle highlights
Programming Hero - Personalized, fun, and interactive way to learn programming
Knotes - An efficient, beautiful Kindle highlights & notes manager
Always Learning - The best resources for learning programming and design
Pocket to Kindle (P2K) - Send articles saved in Pocket to your Kindle