FakeScroll is a lightweight vanilla script for creating nice looking custom scrollbar.
Optiscroll is an tiny and highly optimized custom scrollbar library for modern web apps.
Customize scrollbar in modern browsers with smooth scrolling experience.
It highlights the scrollable area depending on the scrolling amount, thus efficiently explaining to a user what exactly can be scrolled, and is there much to scroll.
Slick Custom Scrollbar lets you replace the default browser scrollbar on long content with a custom one instead, styled using pure CSS. Easily modify the look of the scrollbar using all the power afforded to you by CSS, whether it's giving it a background image, rounded corners, CSS3 shadows, or changing its thickness etc.
Scrollator is a jQuery-based replacement for the browsers scroll bar, which doesn't use any space. Has very good performance
Tiny Scrollbar is a nice and elegant way to enable the scrolling of content on mobile and desktop devices. Its designed to be a dynamic lightweight utility.
jQuery.scrollpanel is a simple vertical scrollpanel that replaces the native vertical browser scrollbar with a CSS-stylable custom scrollbar.
perfect-scrollbar is a tiny jQuery scrollbar plugin for any websites and scrollable region.
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.