There are 2 repositories under iconpacks topic.
Awesome icon packs for WPF and UWP in one library
Just some code samples for MahApps and other experiments...
The Browser for all available Icon packages from MahApps.Metro.IconPacks
🔣 Icons compiled into Windows DLL resource files.
A python script to generate appfilter.xml file for given app icons
安卓APP包名进程图标包代码查询