(click on a tool) Cycle through nested tools

Rectangular Marquee tool

Elliptical Marquee tool

Polygonal Lasso tool

Horizontal Type Mask tool

Text on Selection

Perspective Crop

Straighten tool

Healing Brush tool

Clone Stamp tool

Magic Eraser tool

Smart Brush tool

(click layer thumbnail) Load layer transparency as a selection

Merge a copy of all visible layers into target layer

(use Merge Visible command from the panel pop-up menu) Copy all visible layers to active layer

(click the eye icon) Show/hide all other currently visible layers

Return to default font style

Turn Underlining on/off

Apply an operation of the Magnetic Lasso tool

Fill selection/layer with foreground or background color