Google has released Dart SDK 1.0.
Dart is a “a cross-browser, open source toolkit for structured web applications.” It was first announced back in 2011. Dart SDK 1.0 is the first stable, production release.
The SDK includes a cross-platform Dart Editor, which ships with developer-friendly features like “code completion, refactoring, jump to definition, a debugger, hints and warnings,..”
From the release announcement:
All the information you read to started working with Dart is available at dartlang.org.