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