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These Q&As may be helpful (although it's not exactly click-trough, rather auto-raise):

Focus-follows-mouse (plus auto-raise) on Mac OS X

And one recommendation was MondoMouse ($14.95, free trial)

Focus Follows Mouse

 

Let the mouse pointer hover over a window, and it comes to the front automatically.

Another question in that direction:

Focus Follows Mouse or Sloppy Focus on Mac OS X

With the recommendation of Zooom/2 ($19.95, free trial)

Raise Windows

 

Bring windows to the front by moving the mouse over the window.

These Q&As may be helpful (although it's not exactly click-trough, rather auto-raise):

Focus-follows-mouse (plus auto-raise) on Mac OS X

And one recommendation was MondoMouse ($14.95, free trial)

Focus Follows Mouse

Let the mouse pointer hover over a window, and it comes to the front automatically.

Another question in that direction:

Focus Follows Mouse or Sloppy Focus on Mac OS X

With the recommendation of Zooom/2 ($19.95, free trial)

Raise Windows

Bring windows to the front by moving the mouse over the window.

These Q&As may be helpful (although it's not exactly click-trough, rather auto-raise):

Focus-follows-mouse (plus auto-raise) on Mac OS X

And one recommendation was MondoMouse ($14.95, free trial)

Focus Follows Mouse

Let the mouse pointer hover over a window, and it comes to the front automatically.

Another question in that direction:

Focus Follows Mouse or Sloppy Focus on Mac OS X

With the recommendation of Zooom/2 ($19.95, free trial)

Raise Windows

Bring windows to the front by moving the mouse over the window.

These Q&As may be helpful (although it's not exactly click-trough, rather auto-raise):

Focus-follows-mouse (plus auto-raise) on Mac OS X

And one recommendation was MondoMouse ($14.95, free trial)

Focus Follows Mouse

Let the mouse pointer hover over a window, and it comes to the front automatically.

Another question in that direction:

Focus Follows Mouse or Sloppy Focus on Mac OS X

With the recommendation of Zooom/2 ($19.95, free trial)

Raise Windows

Bring windows to the front by moving the mouse over the window.

These Q&As may be helpful (although it's not exactly click-trough, rather auto-raise):

Focus-follows-mouse (plus auto-raise) on Mac OS X

And one recommendation was MondoMouse ($14.95, free trial)

Focus Follows Mouse

Let the mouse pointer hover over a window, and it comes to the front automatically.

Another question in that direction:

Focus Follows Mouse or Sloppy Focus on Mac OS X

With the recommendation of Zooom/2 ($19.95, free trial)

Raise Windows

Bring windows to the front by moving the mouse over the window.

These Q&As may be helpful (although it's not exactly click-trough, rather auto-raise):

Focus-follows-mouse (plus auto-raise) on Mac OS X

And one recommendation was MondoMouse ($14.95, free trial)

Focus Follows Mouse

Let the mouse pointer hover over a window, and it comes to the front automatically.

Another question in that direction:

Focus Follows Mouse or Sloppy Focus on Mac OS X

With the recommendation of Zooom/2 ($19.95, free trial)

Raise Windows

Bring windows to the front by moving the mouse over the window.