Ask HN: Crossplatform Editor/IDE

Does anyone know a cloud-based or crossplatform code editor/IDE that works on OSX, iOS (iPad and for emergencies iPhone) and Windows? An in-browser app is acceptable and I'd pay for it, but the following features must be included:

- talk to github: clone something, modify, commit && push - run node.js and meteor.js - browser preview and shell (bash) access

Currently I'm constantly switching between computers at work / sparetime, and often an iPad is the only device I have with me.

Any experiences?