Readwise - Effortlessly rediscover and organize your Kindle highlights
Slack News Feed - Get the top posts from every Slack chat you're in.
Knotes - An efficient, beautiful Kindle highlights & notes manager
Lurchr - Saves all your Slack links, so you can focus on work
Clippings.io - Organize the notes you make on your Kindle
Slack It - A bookmarklet to share links in Slack with one click