GUI apps is an area that comes to mind. Gtk3 uses the C API, although you can try and use PGI it is not fully ready. In fact, lots of old graphics and sound

GUI apps is an area that comes to mind. Gtk3 uses the C API, although you can try and use PGI it is not fully ready. In fact, lots of old graphics and sound APIs are the same... basically anything that is not hooked up to the web.