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
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DBCopier Copy data between PostgreSQL and other rational databases
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MongoToDB Ease your MongoDB to PostgreSQL converting work
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DBBlobEditor Edit / Import / Export BLOB data in PostgreSQL