PocketRocket - One article from Pocket to your Inbox everyday
Readwise - Effortlessly rediscover and organize your Kindle highlights
Boomerang Respondable - Write perfect emails with Artificial Intelligence
Knotes - An efficient, beautiful Kindle highlights & notes manager
Klib - Kindle & iBooks Highlights Manager
Pocket to Kindle (P2K) - Send articles saved in Pocket to your Kindle