Wt

Currently Haru can be linked to Wt, offering support to render items to PDF.
There are a couple issues with this, namely #11704, and #11833. So an alternative may be in order here, since development of Haru seems to have halted.

A good alternative seems wkhtmltopdf. This can be integrated into Wt, such that on compile time developers have the option to choose either (much like the WRasterImage or Any implementations).
Haru will still be the default (for now).