Preferences > Memory Usage


Adjustments > Brightness/Contrast


Filters


Blur (note the rendering of the thumb arrow)


Layer Blending


Layer Style


Threshold


Color Balance

Things to keep in mind:

  1. These can be found in just Photoshop; I can’t imagine what I’d find elsewhere in the suite. Actually, fine, here’s the first one I found in Illustrator CS5:
  2. The most common out of all these seems to be second one, Brightness Adjustment.
  3. They’re all ugly. The only near-acceptable one is the Layer Style slider.
  4. None of these looks like the standard OS X slider:

UPDATE: Some clarification here.