WebIDE
<img src='/images/projects/webide.png' style='margin: 30px 0; border: 1px solid #eee;''>
"Official description": WebIDE is a collaborative (real-time) browser IDE complete with syntax highlighting, compile/warning line highlighting, method list via reflection and byte-code analysis, and in-browser console (with standard input).
WebIDE is a hack my friends and I built overnight in 18 hours for Yahoo's University Hack Day here at UC Berkeley! Super useful for online pair programming, WebIDE highlights syntax errors on the fly and can even run Java programs and take standard from inside the browser. I'll admit the design isn't up to par with the usual, but we still got 2nd place out of around 30-40 teams!