Global System Builder (GSB) is a light-weight Integrated Development Environment (IDE) designed to provide software developers with the capability to dynamically program software in real-time from anywhere to anywhere in the world over the internet
using a web browser.
Official website http://globalsystembuilder.com
3 minute promo video http://www.youtube.com/watch?v=cxCZzBPOXJM
Don't forget to click on "watch in high quality"