Amaya

WYSIWYG stands for “What you see is what you get”, and it refers to applications where you can see on the screen exactly what will appear once the document is printed or published. The most basic example of a WYSIWYG application is a word processor, but lately it became very popular for web authoring programs.
Those HTML editors are very useful for people that are not familiar with coding, and they can save a lot of time when creating or customizing websites. Here are some of the features of HTML editors:

• tabbed editing to work on multiple pages
• integrated FTP functionalities
• support for forms, tables and templates
• reliable HTML code creation
• cross-browser compatibility

If you are looking for a free WYSIWYG editor I would recommend either Nvu or Amaya (created by the W3C). Both applications are open source and they are available for Windows, Macintosh and Linux.