jQuery LocalScroll plugin will animate a regular anchor navigation. It will allow your visitors to navigate your site with a smooth scrolling effect.
jQuery SerialScroll plugin allows you to easily animate any series of elements, by sequentially scrolling them. It uses jQuery.ScrollTo to achieve the scrolling animation. It is a very unrestricted plugin, that lets you customize pretty much everything from outside. You can use horizontal or vertical scroll, also combined.
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.
visualNav is a jQuery plugin that modifies a navigation menu to highlight / change when the menu's target smooth scrolls into view.
onScreen is a jQuery plugin that does stuff to elements when they enter or leave the viewport.
You can use it as
Scrolltab is a jQuery plugin that adds tabs visually associated to their position relative to the scroll bar.
This enables a developer to attach floating tabs to the scrollbar of the browser that will scroll the user to the position indicated by the tab. This tab is expandable with content within.
Scrollocue is a jQuery plugin for building a simple autocue/teleprompter system, to scroll through lines of text.
Walk through the autocue text with the arrows, space bar or just click.
Sticky Sidebar is a jQuery plugin for sticky/fixed contents (headers, sidebars, footer, etc...)
Jump To is a jQuery plugin that let you create a smooth jump to sub navigational menu in one JS call. The menu can be used to assist your navigation for pages with a lot of content.
jQuery Fluid Content Scroller plugin makes navigation through long item lists like news, events, blog posts, etc. smooth and easy. Plugin is represented with the tabbed navigation panel at the top and at the bottom of the page / list container allowing to instantly scroll up and down to a particular post on the list.
ScrollToFixed is a jQuery plugin that used to fix elements on the page (top, bottom, anywhere); however, it still allows the element to continue to move left or right with the horizontal scroll.
fullPage.js is a jQuery plugin to create fullscreen scrolling websites in a simple way. It adds an smooth scrolling to the one page site with vertical and landscape sliders forming the site. Compatible with old browsers.
Fancy Scroll is a jQuery plugin to add overflow scroll effect like on iOS/Android for your website.
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.