<a href="https://en.wikipedia.org/wiki/Anki" class="extiw" title="en:Anki">Anki</a> 0.9.6 on Debian GNU/Linux with Xfwm4. A text-only question is asked.
<ul><li>Screenshot: <a href="//commons.wikimedia.org/wiki/User:AVRS" title="User:AVRS">User:AVRS</a></li>
<li>Anki: Damien Elmes, with contributions by "Lac", "Iroiro" and "Frostschutz". Translations provided by Laurent Steffan, Andreas Klauer and "Pcsl".</li>
<li>Icons (<a href="//commons.wikimedia.org/wiki/Category:Crystal_Clear_icons" title="Category:Crystal Clear icons">Crystal Clear</a>):
<ul><li><a rel="nofollow" class="external text" href="http://www.everaldo.com/">Everaldo Coelho</a></li>
<li>Ingolfur Haraldsson</li>
<li>Luiz Claudio dos Santos</li>
<li>Edson Farias</li>
<li>Paulo André</li>
<li>Rhandros Dembiki</li>
<li>André Souza</li></ul></li>
<li>“usstates” deck: <a rel="nofollow" class="external text" href="http://www.ianlewis.org/">Ian Lewis</a></li>
<li>Window titlebar theme: Olivier Fourdan</li></ul>
GPLv3
self-made screenshot