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
BigTube - Makes watching programming tutorials more fun
Clippings.io - Organize the notes you make on your Kindle