It basically allows to run software containers with Jupyter Notebooks and virtual desktops on remote computing resources, let it be a single powerful server on AWS or an HPC cluster managed with a queuing system. Using software containers greatly improves reproducibility and significantly cuts down the time required to setup new software and libraries.
One of its main benefits, besides using software containers, is that it can be integrated with existent infrastructure at user-level. Usually, an SSH account on the computing resource and a pre-installed container engine (Docker, Podman, Singularity/Apptainer) are the only requirements.
Rosetta ships "batteries included" under the Apache 2 open source licence, and as linked in the paper it can be found here: https://www.ict.inaf.it/gitlab/exact/Rosetta/.