Commandline Challenge - Test your command line skills
HackerWeb - A simple and readable Hacker News app
Prompt - Prompt provides fully-integrated writing education solutions, combining instruction, curriculum, and feedback. We support educational institutions, companies, and individuals.
HNwatcher - Track keywords and users on Hacker News
Cwiki - A Command line interface for searching Wikipedia!
Hacker News Stack - Focus on the really fresh and unread news in Hacker News.