Those are various utilities independent of Concerto itself covering things like: logging, external files downloads, stacks etc.
npm install @accordproject/concerto-util --save
Accord Project source code files are made available under the Apache License, Version 2.0 (Apache-2.0), located in the LICENSE file. Accord Project documentation files are made available under the Creative Commons Attribution 4.0 International License (CC-BY-4.0), available at http://creativecommons.org/licenses/by/4.0/.