The ancient app KGraphViewer, for displaying/navigating Graphviz dot graphs, is currently gettings its port to Qt5/KF5 finished and will be released in April 2017. Currently there are only two historic hicolor icons in 32 and 16 px sizes: https://phabricator.kde.org/source/kgraphviewer/browse/master/src/hi32-app-kgraphviewer.png https://phabricator.kde.org/source/kgraphviewer/browse/master/src/hi16-app-kgraphviewer.png It would be nice to have some modern (Breeze) icons :) More info about KGraphViewer at https://www.kde.org/applications/graphics/kgraphviewer/ and https://docs.kde.org/trunk4/en/extragear-graphics/kgraphviewer/using-kgraphviewer.html For the kind of graphs which can be displayed see http://www.graphviz.org/Gallery.php
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/breeze-icons/-/merge_requests/309