Lazarus and Free Pascal are the free and open source alternatives to Delphi. There's also FMXLinux: https://blogs.embarcadero.com/create-powerful-linux-applica

Lazarus and Free Pascal are the free and open source alternatives to Delphi. There's also FMXLinux: https://blogs.embarcadero.com/create-powerful-linux-applications-using-delphi-and-fmxlinux/ https://blogs.embarcadero.com/create-powerful-linux-applicat... Source: I'm a satisfied user of Delphi, but only currently uses Professional and haven't tried out FMXLinux yet.