Readwise - Effortlessly rediscover and organize your Kindle highlights
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Knotes - An efficient, beautiful Kindle highlights & notes manager
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Clippings.io - Organize the notes you make on your Kindle
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.