I personally believe you won't be interested at all since it is by definition even more poweful and complex, but since nobody seems to have mentioned it yet, there's also Template::Alloy, (I've never used it, but ever since I heard of it for the first time, I liked the idea!) by a fellow monk of ours, whose PM handle unfortunately I can't remember ATM: it gives convenient access to several templating systems mini-languages, so one can just choose the one she likes best for any particular task, being allowed to mix them freely.

(Sorry for replying so late!)