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
Slinky - Your slack links — organized!
Clippings.io - Organize the notes you make on your Kindle
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.