https://machine.domain.com/webadaptor/admin/services/System?f=pjson

{
  "folderName": "System",
  "description": "The System folder contains automatically deployed services that are used by ArcGIS Server.",
  "webEncrypted": false,
  "isDefault": true,
  "services": [
    {
      "folderName": "System",
      "serviceName": "CachingControllers",
      "type": "GPServer",
      "description": "The CachingControllers service is used by ArcGIS Server to create and manage Map, Globe and Image service caches."
    },
    {
      "folderName": "System",
      "serviceName": "CachingTools",
      "type": "GPServer",
      "description": "The CachingTools service is used by ArcGIS Server to create and manage Map and Image service caches."
    },
    {
      "folderName": "System",
      "serviceName": "DistributedWorker",
      "type": "GPServer",
      "description": "Launches a work item on a machine in an ArcGIS Server cluster on behalf of a distributed geoprocessing tool."
    },
    {
      "folderName": "System",
      "serviceName": "DynamicMappingHost",
      "type": "MapServer",
      "description": "This service is multi-tenant map service provider."
    },
    {
      "folderName": "System",
      "serviceName": "FeatureServiceTools",
      "type": "GPServer",
      "description": "The FeatureServiceTools service is used by Feature Service to run various tools, e.g. CalculateFeatureService."
    },
    {
      "folderName": "System",
      "serviceName": "GeoAnalyticsManagement",
      "type": "GPServer",
      "description": "The GeoAnalyticsManagement service is provided for management of GeoAnalytics."
    },
    {
      "folderName": "System",
      "serviceName": "GeoAnalyticsTools",
      "type": "GPServer",
      "description": "The GeoAnalyticsTools service is provided for distributed analysis of large datasets."
    },
    {
      "folderName": "System",
      "serviceName": "LocationReferencingSystemTools",
      "type": "GPServer",
      "description": "The LocationReferencingSystemTools service is used for supporting asynchronous Location Referencing capabilities."
    },
    {
      "folderName": "System",
      "serviceName": "OrthomappingTools",
      "type": "GPServer",
      "description": "The OrthomappingTools service is used by ArcGIS Server to provide distributed bundle block adjustment."
    },
    {
      "folderName": "System",
      "serviceName": "ParcelFabricTools",
      "type": "GPServer",
      "description": "The ParcelFabricTools service is used for supporting asynchronous Parcel Fabric capabilities."
    },
    {
      "folderName": "System",
      "serviceName": "PublishingTools",
      "type": "GPServer",
      "description": "The PublishingTools service is used by ArcGIS Server to publish service definition files as services."
    },
    {
      "folderName": "System",
      "serviceName": "RasterAnalysisTools",
      "type": "GPServer",
      "description": "The RasterAnalysisTools service is used by ArcGIS Server to provide distributed raster analysis."
    },
    {
      "folderName": "System",
      "serviceName": "RasterProcessing",
      "type": "ImageServer",
      "description": "The RasterProcessing service is used by ArcGIS Server to process raster data."
    },
    {
      "folderName": "System",
      "serviceName": "RasterProcessingGPU",
      "type": "ImageServer",
      "description": "The RasterProcessingGPU service is used by ArcGIS Server to process raster data using GPU."
    },
    {
      "folderName": "System",
      "serviceName": "RasterRendering",
      "type": "ImageServer",
      "description": "The RasterRendering service is a multi-tenant raster rendering provider."
    },
    {
      "folderName": "System",
      "serviceName": "RealityMappingTools",
      "type": "GPServer",
      "description": "The RealityMappingTools Geoprocessing service is used by ArcGIS Server to support reality mapping workflow using nFrames SURE engine."
    },
    {
      "folderName": "System",
      "serviceName": "ReportingTools",
      "type": "GPServer",
      "description": "The ReportingTools service is used by ArcGIS Server to report cache status for Map and Image service caches."
    },
    {
      "folderName": "System",
      "serviceName": "SceneCachingControllers",
      "type": "GPServer",
      "description": "The SceneCachingControllers service is used by ArcGIS Server to create and manage Scene service caches."
    },
    {
      "folderName": "System",
      "serviceName": "SceneCachingTools",
      "type": "GPServer",
      "description": "The SceneCachingTools service is used by ArcGIS Server to create and manage Scene service caches."
    },
    {
      "folderName": "System",
      "serviceName": "SpatialAnalysisTools",
      "type": "GPServer",
      "description": "The SpatialAnalysisTools service is used for supporting Spatial analysis capability in Portal for ArcGIS."
    },
    {
      "folderName": "System",
      "serviceName": "SyncTools",
      "type": "GPServer",
      "description": "The SyncTools service is used by Feature Service to synchronize your organization's GIS content."
    },
    {
      "folderName": "System",
      "serviceName": "TopographicProductionSystemTools",
      "type": "GPServer",
      "description": "The TopographicProductionSystemTools service is used for supporting asynchronous Topographic Production capabilities."
    },
    {
      "folderName": "System",
      "serviceName": "UtilityNetworkTools",
      "type": "GPServer",
      "description": "The UtilityNetworkTools service is used for supporting asynchronous Utility Network capabilities."
    },
    {
      "folderName": "System",
      "serviceName": "ValidationTools",
      "type": "GPServer",
      "description": "The ValidationTools service is used for supporting asynchronous validation capabilities."
    },
    {
      "folderName": "System",
      "serviceName": "VersionManagementTools",
      "type": "GPServer",
      "description": "The VersionManagementTools service is used for supporting asynchronous Version Management capabilities."
    }
  ]
}