The Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) user facility deploys a mix of long-term fixed atmospheric observatories and short to mid-term mobile facilities with a complex array of instrumentation from surface meteorology and flux stations to lidars, radars, and more. Over 30 years and 4 petabytes of data are publically available in ARM’s data discovery tool. ARM has long developed code to support quality control, data product development, and various other tools for working with the data but these have mostly been developed internally in silos across the various groups of ARM infrastructure. Twenty-one years into existence, ARM released its first open-source community software and has been engaging with the open-science community more and more as the years pass.