everchanging Presence for Mac

From everchanging.com:

everchanging Presence is a content-based Web publishing tool. You create the HTML used to lay out your pages. Once. Then you use that layout to create as many pages as you'd like. Because the actual HTML is generated on-the-fly, you never have to worry about things like style consistency and link management. Presence takes care of all of that for you. Need to change a specific element across your entire site? No problem. And when you move a page or even a folder, Presence is smart enough to fix all of your links for you.

Presence is also a multi-user network application. While it works well on a single computer, it excels at allowing multiple people to provide content for one site at the same time. It features custody control features to ensure that only one person is working on an individual page simultaneously. Automatic version tracking and unlimited persistent page history mean that you can see every state that every page has been in since its inception. The server can even run on headless machines such as Apple's new Xserve. And content can be routed through an administrator or manager for approval before it gets posted.