Top 20 NuGet contract Packages

Contracts ensuring, Messanging, LINQ expression parser and extension methods, Task Parallel Library helpers, Type auto-mapping for storage and benchmark.
A high-performance, extensible argument validation library.
This Guards project is a light-weight toolbox which helps you to protect your public interfaces against invalid parameters being passed over.
Puresharp is a Framework that provides the essential APIs to productively build high quality (.NET 4.5.2+ & .NET Core 2.1+) applications through reliability, scalability and performance without no compromise.
IPuresharp urbanize libraries with strategic private code to lay transparent foundations for Puresharp API .NET
boost_contract-vc141. Compiler: Visual Studio 2017 15.7.4.
boost_contract-vc140. Compiler: Visual Studio 2015 Update 3.
Design by contract programming support
NEO lightwallet / blockchain API for C#. Allows you to interact with smart contracts in the NEO blockchain.
boost_contract-vc120. Compiler: Visual Studio 2013 Update 5.
Advanced model validation library for the modern dotnet world
Library representing the desing by contract programing such as precondition, postconditions, and object invariants
Base classes (like suits, ranks, cards, auction, play, contract) that are helpful in creating a bridge card game.
boost_contract-vc90. Compiler: Visual Studio 2008 SP1.
boost_contract-vc80. Compiler: Visual Studio 2005 SP1.
boost_contract-vc110. Compiler: Visual Studio 2012 Update 4.
boost_contract-vc100. Compiler: Visual Studio 2010 SP1.
A simple tool for unit testing Stratis smart contracts.
The Assumptions libraries provides a method to make implicit assumptions explicit in C#