Opera software has released an official beta of its open-source browser-based debugger, Dragonfly, which enables developers to find errors in complex web pages.
Opera Dragonfly is an open source suite of debugging tools for web developers and designers. When you download the Opera browser, Dragonfly is now built-in and loads automatically. It is described as
a new breed of hybrid application. Part desktop application, part Web application, it is stored in local persistent storage, yet instantly updates when a new version is released, just like your favorite Web sites. You never have to check for updates or install a new version.
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Opera also recently introduced a new beta of version 11.10 of its web browser, code-named "Barracuda", and new versions of Opera Mini and Opera Mobile at this year's South by Southwest (SXSW) event.