Vinaora Nivo Slider is a great slideshow module for Joomla. It allows you to easily create an image slider (slideshow) using Nivo Slider. 
This javascript slider created by dev7studios and was the world’s most awesome jQuery slider. 
It also installed on many WordPress websites, too. It’s absolute free to use.

You can choose slick themes to show your gallery. Not same as Vinaora Slick Show or Vinaora Cu3er 3D Slideshow, 
this slider supports up to 16 unique transition effects without using flash. Vinaora Nivo Slider has been tested in Joomla 1.6, Joomla 1.7, Joomla 2.5 
and well-known browsers: Internet Explorer 7+, Firefox 3+, Google Chrome 4+, Safari 4+ and Opera 10+.

Features

    Joomla 3.x, Joomla 2.5, Joomla 1.5 compatibility
    3 demos included
    3 Slick Themes
    16 unique transition effects
    Simple clean & valid markup
    Loads of settings to tweak
    Built in directional and control navigation
    Supports linking images
    Keyboard Navigation
    Free to use

How to run demo

Open menu “Module Manager“, double click “Vinaora Nivo Slider” module, and then go to “Basic Options“. In “Rundemo”  section, choose one demo from the drop-down list. 
FAQs

    Does the Vinaora Nivo Slider support transparent PNG’s?
    No. Due to the way slide transitions work it will look weird.
    Can I use images that are different sizes?
    No. Once the slider has loaded it won’t change size (it is set to the size of the largest image). So make sure all of your images are the same size.
    Can I have multiple sliders on the same page?
    Yes but you will need to use jQuery v1.4 or greater for it to work.
    Can I set a random starting slide?
    Yes but you will need to install Vinaora Nivo Slider 1.7.4 or greater. And choose startSlide = 0