Our cheat sheets provide a summary of some of the packages that we've been working on.
MultiAssayExperiment TCGAutils
For conversion from PDF to PNG, use the following commands:
convert -density 600 MultiAssayExperiment_QuickRef.pdf -quality 100 ./pngs/MultiAssayExperiment_QuickRef.png
convert -density 600 TCGAutils_QuickRef.pdf -quality 100 ./pngs/TCGAutils_QuickRef.png
Make sure you have ImageMagick installed to use the convert command.