Links (Not Necessarily Tried/Tested)

Ora2Pg - Oracle to PostgreSQL
mdb-sqlite - Access to SQLite
Access To PostgreSQL
SQLAlchemy with reflection
- http://www.tylerlesmann.com/2009/apr/27/copying-databases-across-platforms-sqlalchemy/
http://wiki.postgresql.org/wiki/Converting_from_other_Databases_to_PostgreSQL
http://serverfault.com/questions/274355/how-to-convert-a-postgres-database-to-sqlite
- http://opendbcopy.sourceforge.net/
http://sqlite.com/cvstrac/wiki?p=ConverterTools
- SQLFairy - "SQL::Translator is a group of Perl modules that manipulate structured data definitions (mostly database schemas) in interesting ways, such as converting among different dialects of CREATE syntax (e.g., MySQL-to-Oracle), visualizations of schemas (pseudo-ER diagrams: GraphViz or GD), automatic code generation (using Class::DBI), converting non-RDBMS files to SQL schemas (xSV text files, Excel spreadsheets), serializing parsed schemas (via Storable, YAML and XML), creating documentation (HTML and POD), and more."

WikiSam