Starting from version 3.0, GNU Smalltalk supports grouping multiple files for a single package into a single archive. These are just .zip files, but they are rebranded .star (Smalltalk archive) for this purpose.

A valid .star file must include an XML description of the package in the top directory, in a file that must be called package.xml.

GNU Smalltalk includes gst-package, a tool to create and install .star files.