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