The R–ArcGIS Community is a community driven collection of free, open source projects making it easier and faster for R users to work with ArcGIS data, and ArcGIS users to leverage the analysis capabilities of R.
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People you should know
Please find the ArcGIS Experts (story tellers and developers) on this topic here: https://esri-es.github.io/arcgis-experts/?topic=R-language
They don't work on the support team and some may even not work at Esri, but they are opening some projects and sharing insights related to this technology so we recommend you to follow them.