Moodle Plugins directory: Contributor: Jordi Adell | Moodle.org

The 'Group filter XLS file' plugin allow you to export the grades of a course by filtering by groups, without the need to have set the course in 'Groups' mode. In addition, it allows you to indicate the user profile fields that you want to add in the export from the export page itself. The group name will also appear on the export sheet, whether it has been previously filtered or not.