@Davide Visconti Your best choice is IntraWeb. Rich interface with what you want to use and not get stuck with only one (Ext JS). Combine the powerfull of Delphi in the RAD way with Freedom of IntraWeb. Change your Interface with ZERO coding in Delphi side. Deploy in Service StandAlone (Indy), the Unbeatable StandAlone Http.sys or Isapi.
See this REAL IntraWeb application.
How about transform this:
Into this: