jQuery ClassyScroll can be used not only as replacement of native browser scrollbars, but you can use it even to create slideshows with external controls.
Among other features ClassyScroll can auto adjust scrollbars on window resize and recognize touch events on Android and iOS devices, so it’s perfect for responsive sites that have to dynamically adapt to different environments and devices.
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.
nanoScroller.js is a jQuery plugin that offers a simplistic way of implementing Mac OS X Lion-styled scrollbars for your website. It uses minimal HTML markup being
.nano > .content. The other scrollbar div elements
.pane > .slider are added during run time to prevent clutter in templating.
The latest version utilizes native scrolling and works with the iPad, iPhone, and some Android Tablets.