BLOCS - Visual web design app.
Vector Magic - Easily convert JPG, PNG, BMP, GIF bitmap images to SVG, EPS, PDF, AI, DXF vector images with real full-color tracing, online or using the desktop app!
Sparkle - Design full websites without writing a single line of code
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Rapidweaver - A WYSIWYG web editor for mac.
potrace - Open source program that transforms bitmaps into vector graphics.