Some of the old software before 2010 may not be able to install/run normally on x64 or Windows 10 systems. Be aware of it before purchasing it.
Delphi 3, released in 1997, added:
New VCL components encapsulating the 4.71 version of Windows Common Controls (such as Rebar and Toolbar)
TDataset architecture separated from BDE
DLL debugging
Code insight technology
Component packages, and templates, and integration with COM through interfaces.
DecisionCube and Teechart components for statistical graphing
WebBroker
ActiveForms
MIDAS three tier architecture