Dart and Flutter support for VS Code
I'm not aware of any other formatters for Dart. There's an open issue about more flexible formatting at https://github.com/Dart-Code/Dart-Code/issues/914 but it's not something being actively worked on. If someone was to create their own formatter I've offered in that thread to provide some pointers for wrapping it up into a VS Code extension (the Dart extension already supports disabling its own formatter, although VS Code now allows you to more easily select a different formatter).
An opinionated formatter/linter for Dart code
The standard Dart extension only supports formatting using the SDK-supplied formatter (dart_style) which (by design) is not configurable (although it can be turned on/off with the dart.enableSdkFormatter setting).
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