Readwise - Effortlessly rediscover and organize your Kindle highlights
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Newsletters to Kindle - Read your newsletters on your Kindle
Pocket - When you find something you want to view later, put it in Pocket.
Knotes - An efficient, beautiful Kindle highlights & notes manager
start.me - A Modern-day bookmark manager. A place for your favorites. A news feed (RSS) reader. A browser startpage. A portal for your team.