1. NullableA source code only package which allows you to use .NET's nullable attributes in older target frameworks like .NET Standard 2.0 or the "old" .NET Framework.
2. Celestial.UIToolkitA custom WPF toolkit which is inspired by a lot of the current design languages, including Microsoft's Fluent Design and Google's Material Design.
3. IsExternalInitA source code only package which allows you to use C# 9's init and record features in older target frameworks like .NET Standard 2.0 or the "old" .NET Framework by providing a polyfill for the IsExternalInit class.