Another plugin updated recently for Moodle 2.9 on Moodle plugins database is “Corrections” by Nicolas Dunand. The plugin is now available for Moodle 2.7 onwards.
Corrections plugin allows inline corrections to be set inside any text with the editor. The Moodle administrator can define as many correction types as wanted (e.g. orthographic error, pronoun error, capitalization, etc.). Buttons in the Atto editor then allow users to make inline marks in texts. Read More