DaVinci aims to be a multi-platform/language IDE focusing on web development, developed in Lazarus. It will include a HTML form designer (and a code editor!) and generate valid XHTML/CSS.
IWeaver is an open source web page builder for Windows. As primary tools we give you JavaScript and HTML editors. Both of them have some useful features to make creation of your site easier. JavaScript templates help you to make dynamic pahges very fast.