Web page excerpt editor

We are looking for a script similar to SnippetMaster
(http://www.snippetmaster.com/). We want to give the non-html-coding
client the ability to make edits to one part of one page on their Web
site on a weekly or near-daily basis. We are looking for something
free and turnkey, so we can move on to the next paying client. As
stated, the client is not html-aware so SnippetMaster itself fails our
criteria, the free version does not offer WYSIWYG previews of changes
while editing (http://www.snippetmaster.com/compare.html).

Does anyone have any experience with something else? Alternately, has
anyone written something they'd be willing to share under GPL?

Ski