Readwise - Effortlessly rediscover and organize your Kindle highlights
Journal - Organize all your ideas
Clippings.io - Organize the notes you make on your Kindle
Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
Knotes - An efficient, beautiful Kindle highlights & notes manager
Happyfeed - A simple gratitude journal for iOS