UserGuiding - User onboarding made easy, for less. Create product walkthroughs in a couple of clicks, without breaking the bank.
HackerWeb - A simple and readable Hacker News app
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
HNwatcher - Track keywords and users on Hacker News
Userlane - Digital adoption platform with interactive guidance for software applications allowing anyone to understand and master any software from the get-go.
Hacker News Stack - Focus on the really fresh and unread news in Hacker News.