IE7.js is a JavaScript library to make Microsoft Internet Explorer behave like a standards-compliant browser. It fixes many HTML and CSS issues and makes transparent PNG work correctly under IE5 and IE6.

… gives cross browser SVG support that works all the way back to IE6. Total Win!

Be sure to also check this simple example.

It is a set of libraries, tools and presets to create pixelated indie-style 8/16-bit era games in Javascript that runs in your browser without any Flash plugin, making use of a small small small subset of the HTML5 features, that are actually available on many modern browsers.

Simple but cross-browser library.

Applies SVG (using Keith Wood plugin for jQuery) or canvas method if supported on the client browser (includes explorercanvas patch for ie). If not, applies methods derivated from the work of Walter Zorn for compatibility.

jQuery Tools is a collection of the most important user-interface components for today’s websites. This single JavaScript file weighs only 5.59 Kb