Infinity.js is a UITableView for the web: it speeds up scrolling through long lists and keeps your infinite feeds smooth and stable for your users. It is small, battle-tested, and highly performant. The code is hosted on Github, and distributed under the BSD License. The annotated source is available, as are demos both with Infinity turned off and on.

Infinity.js was built by Airbnb alongside the development of the Popular Wishlists and Friends feeds, and sees daily production use there today. Its only dependency is on jQuery.

Requirements: jQuery framework
Demo: http://airbnb.github.com/infinity/
License: BSD License