It&#x27;s far from perfect, but Corel AfterShot Pro[0] is an example of commercial software that uses Qt and ships for Linux, Mac, and Windows.<p>Some of the imperfections I notice are:<p>* The options dialog has a lot of things that just look &quot;different&quot;.  The controls are native, but the way they&#x27;re positioned, etc, clearly isn&#x27;t.  The Mac has a lot of common things, like which order the Yes&#x2F;No&#x2F;Cancel buttons would appear in a dialog box, that aren&#x27;t done the same in AfterShot.<p>* Being a photo management&#x2F;editing application, it naturally uses a dark theme that looks out of place everywhere.  Adobe Lightroom and Apple&#x27;s now-discontinued Aperture both do this.  It seems to be a normal thing with this type of application.<p>* On Linux, the window decorations come from AfterShot, not from the window manager.  It also has the Windows close&#x2F;minimize&#x2F;maximize buttons.<p>* On an old-enough Mac, the integrated GPU doesn&#x27;t provide the OpenCL stuff that AfterShot requires.  This causes it to crash at startup, whereas a real Mac application would tell the OS to fire up the discrete GPU.<p>* I seriously doubt that it exposes any of its API to AppleScript&#x2F;COM&#x2F;DBUS, but I haven&#x27;t checked.  I know that it doesn&#x27;t register itself as a source for the system-wide photo browser on the Mac (as an example, Insert &gt; Pictures &gt; Photo Browser in Microsoft Word on the Mac will show your Aperture, Photos, and iPhoto libraries as whatever structure they have in that application, not just as files on disk).<p>[0] <a href="http:&#x2F;&#x2F;www.aftershotpro.com&#x2F;en&#x2F;products&#x2F;aftershot-pro&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.aftershotpro.com&#x2F;en&#x2F;products&#x2F;aftershot-pro&#x2F;</a>