Martello

Martello is a Chrome Extension that allows you to power-up your Trello project management with Trello card relationships. Create connections with Trello cards to understand parent, child, and sibling relationships quickly when reviewing your boards and lanes. Once you enable this plugin, you will see the connections features on your Trello board. You can use this new UI to link Trello cards together, and those relationships can be see in the Trello board, and in the Trello card description.