wkhtmltopdf and wkhtmltoimage
wkhtmltopdf and wkhtmltoimage are command line tools to render HTML into PDF and various image formats using the QT Webkit rendering engine. These run entirely "headless" and do not require a display or display service.
See https://wkhtmltopdf.org for updated documentation.
Building
wkhtmltopdf has its own dedicated repository for building and packaging.