From BlenderWiki
Tool shelf
This panel contain sort of bookmarks of commands you wanna do often in the selected mode.
(to be written)
Brush
Active Brush Index
(to be written)
Brush Browser
(to be written)
Brush color
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Brush Diameter
(to be written)
Brush Pressure
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Stroke
Stroke Smooth
(to be written)
Space
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Airbrush
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Curve
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Options
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Last command panel
This panel is on the bottom of the Toolbar and contains all the options of the last tool you use.
(to be written)