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 1 was released in 1995 for the 16-bit Windows 3.1, and was an early example of what became known as Rapid Application Development (RAD) tools. Delphi 1 features included:
Visual two-way tools
Property Method Event (PME) model
TObject, records, component, and owner memory management
Visual Component Library (VCL)
Runtime Library (RTL)
Structured exception handling
Data-aware components live at design time
Database support via BDE and SQL Links