Fancy Before After Compare Image Module is a nice Joomla addon, where you can show the before and after effects by defining two images. Compatible with all the Joomla versions and best used by doctors, architects, designers, etc.

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You can see the demo on the left top of the page here.
Vertical Sliding panel is a nice sliding panel on the top template side position. You can define the contents within the sliding panel. Highly configurable and backed with a 24x7 Customer Support package. This module is cross browser compatible and works on all the modern browsers. Bug Free and works great! Compatible with Joomla 1.5.x , 2.5.x , 3.x.x. The Downloads Access and Extension Support is valid for 6 months from the date of purchase.

 

 

Module Parameter Screenshot