There is a nascent interface being built for Cincom Smalltalk. To try that out, you'll need to:
Get an Account in the Cincom Smalltalk Public Repository
Load the "CouchDB" package from the repository
Once it's loaded, you can try things like this:
"A simple interface to Couch DB. To create, delete, and query databases, try:" CouchDB.Interface default databases. CouchDB.Interface default create: 'mydb'. CouchDB.Interface default delete: 'mydb'. CouchDB.Interface default database: 'mydb' "Further, you can then manipulate documents in a database, try:" myDatabase := CouchDB.Interface default database: 'mydb'. documentRecord := myDatabase save: myDatabase address. myDatabase document: (documentRecord at: 'id'). myDatabase delete: (documentRecord at: 'id') revision: (documentRecord at: 'rev').
The APIs for database are fully implemented, and, other than attachments, the APIs for documents are fully implemented as well