Boreal - A Hacker News iOS app
Pusher Beams - Send push notifications programmatically at scale
HackerScroll - Read top articles from HackerNews in a clean, simple and minimal interface without ads or any other distractions.
Mentioned By - Learn when your site is mentioned by other sites for free
HackerWeb - A simple and readable Hacker News app
Now Push Notify - iOS does not support browser notifications today, but Now Push Notify makes this possible.