Data Migration from Sybase to PostgreSQL?

hp9000 asks: "I've been asked to work on a project that will involve data migration from Sybase to PostgreSQL. I'd like to know if there's any tool, similar to Oracle's Migration Workbench, or even a shell script, to move all data from Sybase tables to PostgreSQL tables, creating the tables/tablespaces/etc in the process or at least generating a script to do so. Any kind of tool, so to speak, that would allow me to perform the migration will be great. I'm not interested in the sql code migration (that will come later if necessary), only tables, indexes, etc. at this point."