Screenshot shows video files of open source video game <a href="https://en.wikipedia.org/wiki/0_A.D._(video_game)" class="extiw" title="wikipedia:0 A.D. (video game)">0 A.D.</a> being edited with open source video editing software Kdenlive (With "Krita Dark" theme)
KDE (video editor) and Wildfire Games (video game inside editor)
GPL
Screenshot of open source video game 0 A.D. inside open source video editing software Kdenlive