Trello Activ Users is a Chrome add-on developed by jerome.raffalli, available for free. This tool falls under the Browsers category, specifically as an Add-ons & Tools subcategory. The main functionality of this add-on is to colorize avatars on a Trello board based on pending tasks. It also provides card filters using 'p' for personal, 'o' for on/off, and 'i' for in progress.

This add-on enhances Trello by highlighting member avatars who have tasks to complete on a card. Users can easily filter Trello cards using the 'P' key to focus on cards where the current user has pending tasks.