Bad news is it’s NOT open source and does have a hefty one time price (with support fee if you want).

Good news is it written by some smart people and works REALLY well. It installs nicely, comes in a deb package (or many others, Mac + Windows also) (it also does work on our Hardy and Feisty Ubuntu servers). Basically it’s “render this html page with this css file” and you’re done. Might not be exactly what you’re shooting for, but if you already have website pages with the content you need to pdf this is PERFECT, or if the added benefit of not learning a new API and getting html versions of documents is a plus it’s pretty great too.

We use it with the Princely rails plugin (on github, rails plugin is open sourced) to print orders, check requests etc on our back end site.