All you need is a modern web browser. From there, you can write code using a great editor, link to a repository and create a site.
Develop your software where ever you go. It'll be there, in the cloud, right where you left it. Just login from a web browser on desktop, laptop, tablet, at an airport, on a bus or even in your office.
Orion incorporates leading edge client technologies together to make an extensible tooling platform. Others fork components like the editor to create their own tooling solutions.