Picasso is available in different versions:
Version that runs out of the shelf (modulo external tools). See the manual section of this page to learn how to run Picasso.
The archive contains all the files to compile and run Picasso on graph rewriting systems.
The archive contains a frontend to run Picasso on pi-calculus processes (with human friendly syntax). The core components are required to use the frontend.
The archive contains a frontend to run Picasso on scala programs (small subset of the language). The core components are required to use the frontend.
Currently, the scala plug-in is on hold and we do not recommend using it. Hopefully, we will find time to rewrite it at some point in the future.