Top 20 NuGet design Packages

Just Another Infrastructure Library. Facilitates some interesting design and architecture practices.
Validation library inspired by the concepts of Secure by Design, by Dan Bergh Johnsson, Daniel Deogun, and Daniel Sawano (MEAP 2019 Manning Publications).
Abp.NServiceBus
A Domain Driven shared library, containing basic components for setting up a Entity Framework Core in the domain with an ApiAuthorization DbContext.