Claw & Quill uses a freeware one, Textpattern, that most often shows up as a weblogging tool, but it's far more flexible than things like Movable Type or WordPress are. Textpattern includes some relatively nifty features and has one of the nicest templating systems that I've seen (all XML-based, and you can write "plugins" in PHP that provide new tags). On the downside, it doesn't have a lot of features whether or not the ones that are there are verifiably nifty, and documentation primarily consists of people puzzling things out on the Textpattern forums, hoping that every so often the developer will emerge from his cave in France and throw out a patch.
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Claw & Quill uses a freeware one, Textpattern, that most often shows up as a weblogging tool, but it's far more flexible than things like Movable Type or WordPress are. Textpattern includes some relatively nifty features and has one of the nicest templating systems that I've seen (all XML-based, and you can write "plugins" in PHP that provide new tags). On the downside, it doesn't have a lot of features whether or not the ones that are there are verifiably nifty, and documentation primarily consists of people puzzling things out on the Textpattern forums, hoping that every so often the developer will emerge from his cave in France and throw out a patch.