Hacker News Stack - Focus on the really fresh and unread news in Hacker News.
Readwise - Effortlessly rediscover and organize your Kindle highlights
Hacker Newsletter - Best of Hacker News in your inbox every Friday.
Knotes - An efficient, beautiful Kindle highlights & notes manager
Box Piper Hacker News - Re-Imagined Hacker News for this decade.
Clippings.io - Organize the notes you make on your Kindle