A free open source Wysiwyg HTML editor. It complies with the W3C's web standards: HTML 4 and 5, CSS 2.1, parts of CSS 3 and SVG.
BlueGriffon is a free open source Wysiwyg HTML editor. It replaces Nvu, an earlier program that was also written by Daniel Glazman. It is based on Gecko 2.0, the rendering engine inside forthcoming Firefox 4.0 and uses Xulrunner, the runtime environment for Gecko. A preview version has been publicly released and it is possible to install nightly builds for Mac OS X, Windows and Linux.
Bluegriffon complies with the W3C's web standards. It can create and edit pages in accordance to HTML 4, XHTML 1.0, HTML 5 and XHTML 5. It supports CSS 2.1 and all parts of CSS 3 already implemented by Gecko. BlueGriffon also includes SVG-edit, an XUL-based editor for SVG that is originally distributed as an add-on to Firefox and was adapted to BlueGriffon.