Readwise - Effortlessly rediscover and organize your Kindle highlights
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Clippings.io - Organize the notes you make on your Kindle
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Knotes - An efficient, beautiful Kindle highlights & notes manager
Front - The platform for exceptional customer service at scale.