TunnelVision - See your next Trello tasks every time you open a browser tab
Nullboard - Minimalist locally-stored kanban board / task list manager.
Pliim - One click and be ready to go up on stage and present!
OpenHub for GitHub - Fast and concise, open-source GitHub client app.
HiddenMe - Hide desktop icons with a single click.
Huboard - HuBoard is built from the ground up using the GitHub public API.