In addition to official samples, you may explore the following open-source projects made by GitHub users.
Custom C# chat bot for Twitch TV
https://github.com/SimpleSandman/TwitchBot
Open source surveillance software
https://github.com/ispysoftware/iSpy
https://github.com/AvaloniaCommunity/Avalonia.FuncUI
A easy-to-use Sony Walkman media manager (VB.NET)
https://github.com/guo40020/WalkmanManager
CloudStream 2 is a Windows and Android streaming app for movies, tv-shows and anime
https://github.com/LagradOst/CloudStream-2
Desktop software for TikTok
https://github.com/ShiiroSan/TikTokForWindows
Multi-platform JCF player
https://github.com/hyvart/Unjammit
Beautiful WPF Control UI
https://github.com/aduskin/AduSkin
Animated Wallpaper System
https://github.com/rocksdanister/lively
Race Control is a standalone, open source F1TV client for Windows, written in C# on the .NET Core platform.
https://github.com/robvdpol/RaceControl
Playing audio books triggred by a RFID card powered by .NET Core running on a Raspberry Pi!
https://github.com/selmaohneh/JukeCore
A terminal based music player using dotnet core 5, libvlcsharp and Terminal.Gui
https://github.com/gareth7562/climusicdotnet
A FMV game made with libvlcsharp and WPF that utilizes the media on the original disks. The game includes clickable surfaces that trigger different videos to play and different outcomes. (The game will not play without the original media from the disks, but the source is still useful).
https://github.com/Teravus/KlingonWin10WPF
Unofficial Instagram Client which almost supports every features in real Instagram.
https://github.com/ramtinak/Minista
GUI Application to work with engine assets, asset bundles, and serialized files
https://github.com/ds5678/AssetRipper
MPD Client for the Universal Windows Platform, based on MpcNET.