Top 20 NuGet validation Packages

Basic classes for working with databases and services
Extension lib containing domain validations and error notifications
This package contains a set of libraries simplifying validation of arguments during coding.
General porpose validation libbrary
This is a simple library cross cutting to DDD, but you can use to any project.
Some containers and base classes for general C# development
Extension lib containing domain validations and error notifications
Kupe validation library
Tools to validate and normalise national identifiers (social security numbers) of Denmark, Finland, Norway and Sweden.
Exposing different methods to validate Models based on Third party library (Fluent Validation)
Exposing different methods interfaces to validate Models based on Third party library (Fluent Validation)
Lite and simple validation library based on composition. It aims to simplify the composition and reuse of validations logics. You create single and simple validations, and then you add those validations to validate an entire model.
A library of extension methods to validate arguments.
Goldlight Contracts is a set of useful little extension methods that can be used to validate the inputs into your methods. This code is .NET Core.
Validierungen von eXTra 1.1-Dokumenten für das OSTC-Server-Verfahren