DIY Air Purifier - Build your own air purifier for under $100
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
Further - Further enables all investors to access this decades best performing asset class: venture capital.
Splittable - Shared living made simple
Egret - Game Engine
EquiTable - Split the bill fairly