First release of the Dart SDK: Stakes and Opportunities for Developers

Dart project aims to replace JavaScript via a modern language, libraries and tools for building good web applications. In 2011, Google had released a technology preview of Dart.

Therefore since October 16, 2012, after thousands of bug reports and feature requests from the web community, a comprehensive version of Dart is available and ready to use.

Like improvements and features added:

• A faster Dart Virtual Machine that on some Octane tests outperforms even V8. 
• A new Dart to JavaScript translator that generates fast and compact output.
• An HTML library that works transparently on modern browsers.
• A library to interoperate with JavaScript code.
• An easy to use editor.
• Pub, a new package manager
• Dartium, a Chromium build with native Dart support.
• A server-side I/O library.
• A language specification describing the Dart semantics, including new features.

You can download the Dart Editor from dartlang.org. It comes with a copy of the open-source SDK and Dartium.