Click:

Visit the project associated with the node.

Click + Hold + Drag:

Adjust the position of the node.

Click the background + Drag:

Rotate the view.

Mouse-Wheel / Middle-Click:

Zoom in or out.

Right-Click:

Pan the graph.

Tap:

Visit the project associated with the node.

Tap + Hold + Drag:

Adjust the position of the node.

Swipe:

Rotate the view.

Pinch Gesture:

Zoom in or out.

Two Fingers:

Pan the graph.