https://github.com/brentthorne/posterdown
https://github.com/rstudio/pagedown
https://github.com/GerkeLab/betterposter
https://github.com/pzhaonet/postr
https://github.com/odeleongt/postr
https://github.com/odeleongt/flexdashboard-poster
https://github.com/bbucior/drposter
https://github.com/mathematicalcoffee/beamerposter-rmarkdown-example
The URL to the example at https://github.com/BenBarnard/pdfposter is no longer valid...