I came across a wysiwyg web authoring tool for both Lunix and Windows. It’s still in beta, but it looks like it might be a solid starter program for html.
http://www.nvu.com/
NVU is based on mozilla composer, which is what I use. I like mozilla composer because it doesn’t get in the way of me writing the HTML by hand (in their very nice editor window) for one part, and WYSIWYG for another part. The WYSIWYG part is very simple and doesn’t have a lot of features, which is one of the things that NVU is adding. It also adds website management features, ala frontpage and dreamweaver.
Mozilla composer will also work with OS X.