Elegantt for Trello - The most elegant way to manage your Trello projects
Nullboard - Minimalist locally-stored kanban board / task list manager.
TunnelVision - See your next Trello tasks every time you open a browser tab
Waffle - Split screen picture conversations with friends
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Brisqi - Offline-first personal Kanban app