Given the sad news of the passing of Erik van Pienbroek, I suppose at this stage his packages should be orphaned.
I've had a look at what packages he's marked as point of contact in pkgdb [1], in particular the following are packages without comaintainers:
mingw-webkitgtk mingw-gtkhtml3 mingw-qt5-qtxmlpatterns mingw-qt5-qtwinextras mingw-qt5-qtwebsockets mingw-qt5-qtwebkit mingw-qt5-qttranslations mingw-qt5-qttools mingw-qt5-qtsystems mingw-qt5-qtsvg mingw-qt5-qtsensors mingw-qt5-qtscript mingw-qt5-qtscript mingw-qt5-qtmultimedia mingw-qt5-qtlocation mingw-qt5-qtjsbackend mingw-qt5-qtimageformats mingw-qt5-qtgraphicaleffects mingw-qt5-qtdeclarative mingw-qt5-qtbase mingw-qt5-qtactiveqt mingw-qt5-qt3d mingw-libtiff mingw-enchant mingw-curl mingw-angleproject mingw-SDL_mixer mingw-SDL_image
I'd be interested in taking mingw-qt5-*, mingw-libtiff, mingw-enchant, mingw-curl, mingw-angleproject
Best Sandro
[1] https://admin.fedoraproject.org/pkgdb/packager/epienbro/