Hacker News Front Page Explorer - A database of top ranking Hacker News front page posts
Why is this interesting? - Every weekday Noah Brier & Colin Nagy (and friends) send an email about something interesting.
Hacker News-cli - Browse Hacker News from your Terminal
Hacker Newsletter - Best of Hacker News in your inbox every Friday.
Hive - Seamless project management and collaboration for your team.
Box Piper Hacker News - Re-Imagined Hacker News for this decade.