Solution: write one yourself.
I’m currently working on a basic Velocity bundle for Textmate. We use it as a templating language at work, and, let’s face it, Textmate is an awesome editor with many, many ways to make your life easier. Given that it’s listed as a bundle people might be interested in… I’d better get started on it, right?
If you’re interested, leave a comment or drop me an email. So far I’ve got some basic function and syntax highlighting, along with autocompletion of some common constructs. Once it’s more finalised – and has been built in accordance to the VTL spec, not just the way I write it, I’ll start putting out releases.
(And if none of this makes much sense: Velocity/VTL is a templating language for Java web-apps. It’s one of the least sucky Java templating languages, apparently, but it’s not as mature of fully-featured as, say, Smarty.)