Bleach — HTML sanitizer, which some might say is an impossible task.
TAT Home — a gesture-powered 3d home screen for Android.
Omaha — the autoupdater used in Chrome and other Google projects, open sourced.
Google Refine — Freebase GridWorks has new home and new name, with new checkins happening all the time. An excellent ETL tool for figuring out what data you have and getting it into the right format.
