Auto Fix Anything jQuery plugin will let you automatically fix position of any container on your website with one JS call. The plugin will detect when to fix/unfix the position automatically.
Sticky Sidebar is a jQuery plugin for sticky/fixed contents (headers, sidebars, footer, etc...)
hcSticky is a cross-browser jQuery plugin that makes any element on your page float. It is used for sidebars on long pages, so they can be visible all the time user scrolls down the page, instead of a empty space visitors usually see.
It is also used for floating top menus, emphasizing it to the user at all time.
Sticky-Kit is a jQuery plugin for making smart sticky elements Sticky-Kit provides an easy way to attach elements to the page when the user scrolls such that the element is always visible.
fixto is a jQuery plugin for sticky positioning. Fix containers to the viewport relative to an ancestor.
jQuery lockfixed allows for DOM elements to be positioned anywhere on the page, and lock within the user's viewport when scrolling. Common use case is a menu under a header, which on scrolling stays fixed within the viewport.
jQuery Stick 'em plugin makes items sticky as you scroll, to a point. Easy to implement and flawless to the point of perfection, this is indeed a very useful plugin.
stickyMojo is a contained sticky sidebar plugin for jQuery. It is lightweight, fast, flexible and compatible with Firefox, Chrome, Safari, and IE8+. It will degrade gracefully in older versions of IE.