CDE is a Polymer application written in Dart and incorporates the Ace editor, which in turn is based on Cloud9 IDE and Mozilla Bespin/Skywriter, an embeddable editor that supports syntax highlighting for over 100 languages. Being a Chrome App, it has access to the file system and can communicate with mobile devices via USB. CDE supports the last two versions of all major desktop and mobile browsers.
Chrome Dev Editor runs a local webserver for testing the projects developed, and can deploy an app directly to the Chrome Web Store or a mobile device, currently only Android. It has integrated Git as a version control system.
Chrome Dev Editor is currently a Developer Preview. It is open sourced under Apache 2.0 and the source code is available on GitHub.