Freshmeat page: http://freshmeat.net/projects/dolt/
dolt is a cross platform HTML preprocessor, which replaces specially formatted HTML comments with the contents of another file. It works much the same way as SSI, but without the server requirements, as files are processed before they are uploaded to a Web server. For example, it allows you to update a menu on every page by changing one file. This gives you some of the benefits of frames without any of the problems.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!