Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Readwise - Effortlessly rediscover and organize your Kindle highlights
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Knotes - An efficient, beautiful Kindle highlights & notes manager
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
Clippings.io - Organize the notes you make on your Kindle