Q: I would like to know the difference between the wowslider program and the VisualSlideShow. Though they are found on different websites, they appear to me to be from the same company. Is this correct? The user interface surely looks similar.
A: The main difference is engine. wowslider is jquery-based, VisualSlideShow is mootools-based.
wowslider and VisualSlideShow provide different templates and transition effects. Also, they use different ways of thumbnail displaying.
wowslider app. allows to insert several separate slideshows per page, you can add only one slideshow per page with VisualSlideShow app.
wowslider app. can generate modules for WordPress, VisualSlideShow app. can not.
VisualSlideShow app. allows to add music to slideshow and control size of thumbnails, wowslider app. doesn't allow to do it.