This Common Lisp library aims to simplify working with CSVs:

* reads/writes CSVs from/to strings, streams and files * support streaming reads (allowing processing very large CSVs, through read-csv's row-fn parameter) * supports custom data formatting * settable quote, separator and quote-escapes * supports multiline quoted data * a test suite * detailed state about the process on error (line number, column number, char index), current collection state