nVu is getting close to release.
Nvu 1.0 Preview is an open source web authoring application based on Gecko, the Mozilla layout engine. It includes WYSIWYG page editing, integrated file management via FTP, HTML source editing, tabbed views, a CSS editor, and other features. This release adds support for HTML 4.01 Strict and Transitional and XHTML 1.0 Strict and Transitional, automatic disabling of UI elements not allowed by the DTD of the current document, new Help contents, and other changes. Nvu is free for Mac OS X 10.1.5 and up, Linux, and Windows.In addition to working with OS X, it's also bundled with Linspire.