Walkaround - Walkaround is a variant of Wave, based on the Apache Wave code base, that runs on App Engine.
SmartWindows.app - Auto arrange all your app windows, whether on one screen or many with a single click!
Slack - A messaging app for teams who see through the Earth!
Accelerated - Online community to break into tech & VC
Rizzoma - Email and IM are linear contextless communication tools.
VC Starter Kit - Everything you need to look like a Venture Capitalist