Jamboard - Interactive Business Whiteboard | G Suite
Elegantt for Trello - The most elegant way to manage your Trello projects
StandupScreen for Trello - Turn a magnetic whiteboard into an interactive Trello board
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Witeboard - A real-time whiteboard for your team. No signups required.
TunnelVision - See your next Trello tasks every time you open a browser tab