Add a command-line utility to export content in YAML format https://www.drupal.org/project/drupal/issues/3532694 Export content to yaml.
Views Data Export PHPSpreadsheet https://www.drupal.org/project/views_data_export_phpspreadsheet Additional spreadsheet file plugins for Views Data Export. Add header/footer text to file.
Feeds Extensible Parsers https://www.drupal.org/project/feeds_ex Additional XML/Json parsers for Feeds.