I just know I’m gonna get raked, but try Lazarus. A Delphi clone using the FreePascal compiler. Has a framework similar to the VCL, but has pluggable backends. Qt, GTK, Windows, Cocoa, and a native one, though I’m not sure of its maturity. Component programming that is relatively easy to extend.
The show’s name is Black Mirror, not Black/White Mirror. Of course it’s the monkey’s paw of tech.