HackerWeb - A simple and readable Hacker News app
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style
HNwatcher - Track keywords and users on Hacker News
Gource - Gource is a software version control visualization tool.
Hacker News Stack - Focus on the really fresh and unread news in Hacker News.
Codeology - Open-source algorithm that visualizes GitHub projects