JQuery Development Tools

• Tools for Firefox
  
  • Firequery
  • Firebug
  • Web Developer Toolbar
  • Venkmen
• Tools for Internet Explorer
  
  • Microsoft Internet Explorer Developer Toolbar
  • Microsoft Visual Web Developer
  • DebugBar
• Tools for Safari
  
  • Develop Menu (Available in Preferences menu item -> Advance Tab)
  • Web Inspector
• Tools for Google Chrome
  
  • Web Developer
  • Firebug Lite
  • Chrome Editor
  • Pendule
  • jsshell

You can also test your code online on jsbin.