Here is a small collection of Qt stylesheets (QSS) or QStyle ideas

Theme repo

QSS

• QDarkStyleSheet
• GTRONICK-QSS
• qss-dracula
• qt-material, look at https://github.com/UN-GCPDS/qt-material/issues/28 and https://github.com/UN-GCPDS/qt-material/issues/25
• BreezeStyleSheets
• SARibbon, also QStyles
• QtFluentDesign

QStyle

• QGoodWindow
• Qt-Frameless-Window-DarkStyle
• TTKWidget

Theme is a part of monorepo

• mumble-theme, moved to monorepo https://github.com/mumble-voip/mumble/tree/master/themes/Default
• FreeCAD-qss - FreeCad stylesheets, can be used separately
• QGis-qss
• bauh-qss
• modorganizer-qss
• avalon-qss
• napari-qss
• liteide-qss
• QWidgetDemo