chromeless : The chromeless project is an experiment into making it possible to build a web browser using only web technologies, like HTML, JavaScript, and CSS.
LokiJS : A fast, in-memory document-oriented datastore for node.js, browser and cordova
The HTML5 Shiv : The HTML5 Shiv enables use of HTML5 sectioning elements in legacy Internet Explorer and provides basic HTML5 styling for Internet Explorer 6-9, Safari...
SlimerJS : A scriptable browser for Web developers
TraceKit : Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.
A JavaScript file you can insert into your pages to simulate the Firebug console in browsers that are not named Firefox.
