restful json datasnap scalable multi-tier frameworks delphi

  NetHTTP TNetHTTPClient  TNetHTTPRequest
 REST TRESTClient TRESTRequest TRESTResponse TRESTResponseDataSetAdapter
 Indy IdHTTP IdSSLOpenSSL
 JavaScript jQuery(Mobile Http DOM Ajax JavaScript RESTful REST web service API  
 DataSnap REST server HTML5 client
 
 REST Services TRESTClient TRESTRequest TRESTResponse components
 System.DateUtils,System.SyncObjs, System.Math,
 System. Generics.Collections,
 System.Rtti, System.Bindings.Outputs,
 System.JSON,
 System.JSON.Builders, System.JSON.Readers,
  FMX.Types, FMX.Forms, FMX.Dialogs, FMX.Layouts,
  FMX.Objects, FMX.ListBox, FMX.Ani, FMX.Gestures, FMX.StdCtrls,
  FMX.DateTimeCtrls, FMX.Graphics,
  FMX.Media, FMX.ScrollBox, FMX.Memo, FMX.Calendar, FMX.Edit,
  FMX.Controls, FMX.Controls.Presentation,
  FMX.TreeView, FMX.TabControl,
 
  REST.Utils,
  REST.Types,
  REST.Client,
  REST.Response.Adapter,
  REST.Authenticator.Simple,
  REST.Authenticator.Basic,
  REST.Authenticator.OAuth, IPPeerClient, Data.Bind.Components;

https://www.embarcadero.com/cn/free-tools/rest-debugger/free-download