Hacker News Stack - Focus on the really fresh and unread news in Hacker News.
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Hacker News Front Page Explorer - A database of top ranking Hacker News front page posts
Hacker Newsletter - Best of Hacker News in your inbox every Friday.
Box Piper Hacker News - Re-Imagined Hacker News for this decade.
HN to Kindle - Read Hacker News on your Kindle