YouTube Video Gallery is a great module to showcase your YouTube videos in a nice sliding manner. All you need to do is, define the YouTube video URLs, thumbnail URL and title.
Fancy Tooltips is the best available Tooltips Plugin for Joomla. All you need to do is to install and activate.
Registration Redirector is the best redirector plugin for Joomla, which gives you the complete control, where to redirect your Joomla Registration.
Fancy Scroller is a nice top text scroller module for Joomla, which is best used for news, external links and stock news.
Smooth Scroll to Top is a Joomla module, which scrolls your website to the top with a nice and smooth scrolling manner and it comes with a lot of options and parameters.