Play.ht (for Medium) is a Free Chrome Extension to Listen to any article on Medium as an Audio Narration.
Hark News is an iOS app that takes the links to articles you're reading and converts them into audio files you can play on the go. You can listen to the latest news or stories offline and while you're doing chores around the house instead of having to sit down and actually read them.
Syncr is a multi-platform tool that stitches together a podcast from a bundle of your favorite YouTube videos that you can listen to anywhere at anytime.
Kindle Robot is the simplest way to send books to your Kindle.