Boardly - A minimalistic planning board for your projects
Elegantt for Trello - The most elegant way to manage your Trello projects
Corrello - Dashboards for agile teams using Trello
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
TunnelVision - See your next Trello tasks every time you open a browser tab