Web-based animation suite its original goal was to be a usable Flash IDE alternative, but has evolved into a cross-platform and cross-format animation tool, primed to support Animated GIFs, SWF (Flash), SVG Animations, and more. There are browser based and stand alone applications.
Adobe® BrowserLab is an online service that helps ensure your web content displays as intended. Accurately preview web pages across multiple browsers and operating systems, navigate links, and use diagnostic tools to optimize websites efficiently. This Adobe CS Live service is free at least until April 2012 and it is also available within Dreamweaver, as a Firebug add-on for Firefox, Safari or IE.
Cage app, online collaboration tool – excellent tool suitable for any size workgroups.
Very useful selection of tools for every web designer - advanced eyedropper, color picker, palette viewer. You also get a CSS gradient generator and an analyzer that finds the CSS rules...