Quanta Plus is a highly stable and feature rich web development environment. The vision with Quanta has always been to start with the best architectural foundations, design for efficient and natural use and enable maximal user extensibility. For the casual user may find it intimidating the web developer will find it has a wide array of advanced features. You can import DTDs, write scripts to manage editor contents, visually create dialogs for your scripts and assign script actions to nearly any file operation in a project. You can even look at and communicate with a wide range of what happens inside Quanta using DCOP.
If you are looking for a "What You See Is What You Get" style web development check out kompozer. It is an easy to use web development application for the novice. No coding skills are required.