R is a language and free software environment for statistical computing and graphics. RStudio provides free and open source tools for R.
PostgreSQL is a powerful, open source object-relational database system. PostGIS and pgRouting are spatial database extensions for PostgreSQL that add support for geographic objects and geospatial routing. QGIS is a free and open source geographic information system.
SafeGraph is a data company offering highly accurate data about physical points of interest (POIs) in the US, UK and Canada including machine generated, human verified building footprint polygons, core location data, and aggregated foot traffic or foot fall on specific POIs or Census Block Groups (CBGs),