Top 20 NuGet contracts Packages

Code Contracts and common functionalities used by other PostSharp pattern libraries. An official PostSharp pattern library.
OS33 API data contracts
Contracts for Storm Connect.
Common contracts for a Modular Architecture.
Argument validation made simple and unified. It ensures arguments conforms to simple validation rules and provides an uniformed exception throwing strategy if arguments are invalid.
Referenced by microservice public-facing interfaces. Provides common facilities that are needed to define a service's contract. Part of the Microdot framework.
Static methods to simplify argument validity checking.
Implements the XMPP IoT legal identities, smart contracts and signatures extesion as defined by the IEEE XMPP IoT Interface working group.
This Guards project is a light-weight toolbox which helps you to protect your public interfaces against invalid parameters being passed over.
Shared contracts (models).
Contracts used with Storm ExportFeedService
A simple library that facilitates runtime checks of code and allows to define preconditions and invariants within a method.
ClassFactory Contracts.
Simple Guard (or DbC) implementation.
A distributed contracts-based sender/handler messaging system built on RabbitMQ and BearBones-Messaging
Featurify.Contracts provides all the necessary interfaces required to define classes required while adding the Featurify package for implementing user specific feature toggles
Long Running Process Execution in Dotnet. Runs long running processes in the background of your application allowing you to fire and forget any long running processes you may need to execute. The cross cutting concerns running throughout the Microphobia platform.
NuGet package of the Intent.Application.Contracts as per https://github.com/IntentSoftware/IntentArchitect/tree/master/Modules/Intent.Modules.Application.Contracts. Use this package to extend the module through use of decorator interfaces within it.
Contains the core message contracts for MicroBus which includes the command, query and event interfaces
Contains the core infrastructure contracts for MicroBus which includes the handler and main MicroBus interfaces