Pinax is an open source platform for rapidly developing websites.
Gondor is the leading Python and Django cloud hosting platform.
Habitualist is a great way of tracking the things you want to do on a regular basis, the things you want to turn in to habits.
ThoughtStreams is the best way to share your thoughts, ideas, experiments and observations.
Quisition is a browser-based flashcard system that repeats old cards and introduces new ones at optimal time intervals.
Typewar is an addictive font recognition game that pits your typeface knowledge against that of others.