TouchDevelop -web-based Windows 8 app creator
Microsoft has announced TouchDevelop,a web based windows 8 app creator. TouchDevelop Web App is a development environment to create apps on your tablet or smartphone, without requiring a separate PC. Scripts written by using TouchDevelop can access data, media, and sensors on the phone, tablet, and PC.
To use just sign in via your Windows Live, Facebook, or Google account.