Mapserver provides OGC web-services that can be used to pull soil data directly from ISRIC servers (Please check ISRIC's data policy, disclaimer and citation).
GIS softwares like QGIS and ArcGIS can be used to download data for specific areas, together with links bellow indicated.
For data citation and license, please consult our: Data and Software Policy
Please check the ISRIC tutorial on how to access layers:
WMS: https://www.isric.org/instruction-wms
WCS: https://www.isric.org/web-coverage-services-wcs
For soilgrids FAQ and information: Soilgrids FAQ