Navioo
- Provides a list of all classes of the language's core with navigators compatibility test.
- http://www.navioo.com

Client-Side JavaScript Guide
- Books on how to use core and client-side JavaScript.
- http://docs.sun.com/source/816-6408-10/

ECMA-262: ECMAScript specification
- The official specification for ECMAScript, the vendor-neutral standard for what was originally Netscape's JavaScript.
- http://www.ecma-international.org/publications/standards/Ecma-262.htm

Dr. Clue's javascript reference
- a handy repackaging and extension of javascript documentation designed for quick reference as well as detailed study.
- http://www.drclue.net/F1.cgi/JAVASCRIPT/JAVASCRIPT.html

DOM Node and Object Structure Summary
- This gives all properties, collections and methods of the W3C DOM that can be reliably used in all major DOM browsers, as well as document.styleSheets, which is very unreliable, but useful if it works.
- http://www.howtocreate.co.uk/tutorials/index.php?tut=0&part=28

JavaScript Object Hierarchy
- A table of the most commonly used JavaScript objects, with all of their properties, methods, and event handlers.
- http://archive.devx.com/projectcool/developer/reference/jscript_obj.html

Microsoft JScript
- Microsoft JScript documentation: JScript User's Guide. Using JScript in Internet Explorer. JScript Language Reference.
- http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/js56jsoriJScript.asp?frame=true

JavaScript 2.0 at Mozilla.org
- language design page for JavaScript 2.0, which extends JavaScript with classes, packages and types.
- http://www.mozilla.org/js/language/js20/index.html

DevGuru JavaScript Quick Reference
- List of every command and function with individual page descriptions.
- http://www.devguru.com/Technologies/ecmascript/quickref/javascript_index.html

Woodger's JavaScript Reference
- JavaScript Overview as well as coding tips.
- http://www.woodger.ca/js_top.htm

JavaScript R&E Site
- reference, syntax, and examples you can use.
- http://fluffycat.com/javascript/

JavaScript and Browser Objects Quick Reference
- Free downloadable reference guide to JavaScript objects and properties in PDF format, designed for printing. Covers all versions of JavaScript, and indicates which browsers support each object or language element. From Danny Goodman's book "JavaScr
- http://www.dannyg.com/ref/jsquickref.html