GitHub - lepoco/wpfui: WPF UI provides the Fluent experience in your known and loved WPF framework. Intuitive design, themes, navigation and new immersive controls. All natively and effortlessly.
Complete UI toolbox with over 160 WPF controls - Telerik UI for WPF
FREE Metro Light and Dark Themes for WPF and Silverlight Microsoft Controls - Brian Lagunas
WPF Tutorial: User Controls in WPF | User Control | Visual studio | C# - YouTube
Syncfusion WPF Controls Examples - Microsoft Llamkanakuna