Frosty is now public and open sourced under a very permissive BSD-3 licence.
This package makes FROST Taproot threshold signatures available to Dart/Flutter apps and is used for the Noosphere ROAST implementation that makes it easy to coordinate and create these signatures (and will soon be integrated into the Peercoin Flutter wallet). We welcome all bug reports and pull requests.
https://pub.dev/packages/frosty