Withdata Software provide some ETL (Extract-Transform-Load) tools for PostgreSQL:
FileToDB Load TXT, CSV, TSV, XML, JSON, Excel, SQL, RDF, INI data to PostgreSQL
DBToFile Export PostgreSQL data to TXT, CSV, TSV, XML, JSON, Excel, SQL files
DBCopier Copy data between PostgreSQL and other rational databases
MongoToDB Ease your MongoDB to PostgreSQL converting work
DBBlobEditor Edit / Import / Export BLOB data in PostgreSQL