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.

Use Mate. It is based on the old Gnome 2

Not to mention his cousin Skid, who went broke buying underwear.