PrognRoll is a tiny jQuery plugin that creates scroll progress bar on the page. You can also customize the progress bar.
It has different easing functions and tries to use CSS-Transitions to animate elements.
Bootstrap has only a traditional horizontal carousel. This plugin has the HTML and CSS to get it to animate vertically with up/down carousel controls.
Create a simple scroll indicator for your website by using css and jQuery. An animated arrow to show that content is below the fold.
A simple jQuery plugin for changing background color while scrolling.
A tutorial about creating lightweight smooth anchor scrolling with jQuery. Also a basic scrollTop function included.
It's open-source (MIT), free and easy to use.
Web Ticker is a jQuery plugin that allows you to have items scrolling indefinitely across the screen. It uses some fancy calculations to ensure smooth continuous transitions.
A simple navigation that auto-hides when the user scrolls down, and becomes visible when the user scrolls up.
Triggers classes on html elements based on the scroll position. It makes use of requestAnimationFrame so it doesn't jack the users scroll, that way the user / browser keeps their original scroll behaviour.
Optiscroll is an tiny and highly optimized custom scrollbar library for modern web apps.