The source code is in Cincom's public store.
You need VisualWorks (7.6 or later) with StoreForPostgreSQL loaded.
To connect to the repository, enter the following in the store connection dialog:
Interface: PostgresSocketConnection "PostgreSQLEXDIConnection prior to VW 8.0" Environment: store.cincomsmalltalk.com:5432_store_public User name: guest Password: guest Table Owner: BERN
Load the bundle PDF Development to get everything needed for development into the image.