Adobe Flash - Create vector graphics for the Web. - http://www.adobe.com/products/flash/flashpro/
Adobe Dreamweaver. - Extremely powerful site building tool. Support for DHTML and CSS, with ready-to-use JavaScript actions. Site-management tools. 30 day evaluation copy available for download. - http://www.adobe.com/products/dreamweaver/
LiveStage - QuickTime authoring environment for interactive Web media (from Totally Hip Software). - http://www.totallyhip.com/livestage.asp
oXygen - Support for XML, XML Schema, DTD, XSL and TXT documents. Features XSLT transformation, Unicode support, FOP support, browser preview, automatic DTD generation, code insight and outliner. - http://www.oxygenxml.com
ColorWeb Pro - Provides optimized RGB and HTML values for Pantone colors for use in web pages, and presentations. - http://www.pantone.com/products/products.asp?idSubArea=0&idArea=2&idProduct=347
BBEdit - Famed Macintosh text editor - includes many features which have been specifically developed in response to the needs of HTML authors. - http://www.barebones.com/products/bbedit/bbedit.html