Useful JQuery
Quovolver
Quovolver is a jQuery plugin for revolving multiple testimonials or quotes in your document. Although, it can also be used to cycle through any group of elements.
http://sebnitu.github.io/Quovolver/
Isotope
Filtering and sorting
http://isotope.metafizzy.co/
Maps
Good for maps and pins
http://gmap3.net/
Waypoints
Execute javascript when you scroll to a point
http://imakewebthings.com/waypoints/
Smooth Scroll
Scrolls to a link on the same page
https://github.com/kswedberg/jquery-smooth-scroll
Fancybox
Opens a window in the same page while fading the background
http://fancyapps.com/fancybox/
bxslider
Slider
http://bxslider.com/
Alpaca
Form made easy
http://www.alpacajs.org/