The Dart SDK is a set of tools and libraries for the Dart programming language. You can find information about Dart online at dartlang.org. Here's a brief guide to what's in here: bin/ Binaries/scripts to compile, run, and manage Dart applications. dart Dart virtual machine dart2js Dart-to-JavaScript compiler dartanalyzer Dart static analyzer docgen Dart documentation generator pub Pub, the Dart package manager dartfmt Dart code formatter lib/ Libraries that are shipped with the Dart runtime. More information is available at api.dartlang.org. packages/ Additional packages that are shipped outside of the Dart runtime. More information is available at api.dartlang.org. version The version number of the SDK (ex. 1.5.1). revision The Subversion revision of the SDK build (ex. 37107).