The Grav Stamp Plugin is designed for Grav CMS and automatically adds or changes date_modified, editor and revision to frontmatter when a page is saved via the Grav Admin Plugin. Optionally adds Twig variable users which contains data from user accounts.
Could an option be provided to save just the username in the editor field instead of fullname? The fullname isn't a unique field, and could be abused by a user changing it to appear as someone else.