Scroll Loop Menu is a simple infinitely scrollable menu based on the looping scroll illusion of cloned items.
jQuery.scrollable manages animated scrolling in windows, scrollable elements and iframes. It frees you from handling gotchas and edge cases and offers convenient, flexible options for animation.
Endless.js is a simple jQuery plugin that allows an infinite scroll on any scrollable HTML element.
The idea is to join the top with the bottom or the left with the right. So when you are at the end or the beginning, you can scroll again and you will are done a complete tour.
slimScroll is a small jQuery plugin that transforms any div into a scrollable area with a nice scrollbar - similar to the one Facebook and Google started using in their products recently.
slimScroll doesn't occupy any visual space as it only appears on a user initiated mouse-over. User can drag the scrollbar or use mouse-wheel to change the scroll value.