ClosedXML by: Amir Ghezelbash Francois Botha Manuel De Leon

ClosedXML makes it easier for developers to create Excel 2007+ (.xlsx, .xlsm, etc) files. It provides a nice object oriented way to manipulate the files (similar to VBA) without dealing with the hassles of XML Documents. It can be used by any .NET language like C# and Visual Basic (VB).

CodeProject.ObjectPool by: Ofir Makmal <ofir.makmal@gmail.com> Alessio Parma <alessio.parma@gmail.com>

A generic, concurrent, portable and flexible Object Pool for the .NET Framework. It is completely based on the Code Project article of Ofir Makmal (http://goo.gl/4qig6T). Library is production ready and it is successfully working in real life systems. Original source code has been modified, in order to introduce a Parameterized Object Pool, already drafted by Ofir Makmal in the comments of the article. Moreover, a few unit tests have been added, in order to improve code reliability, and a lot of other small changes have also been applied. Of course, all modified source code is freely available at the project URL of this package. Many thanks to Ofir Makmal for his great work.

CommandLineParser by: Giacomo Stelluti Scala

The Command Line Parser Library offers to CLR applications a clean and concise API for manipulating command line arguments and related tasks.

Common.Logging by: Aleksandar Seovic Mark Pollack Erich Eichinger Stephen Bohlen

Common.Logging library introduces a simple abstraction to allow you to select a specific logging implementation at runtime.

Common.Logging.Core by: Aleksandar Seovic Mark Pollack Erich Eichinger Stephen Bohlen

Common.Logging.Core contains the portable (PCL) implementation of the Common.Logging low-level abstractions common to all other Common.Logging packages.

Common.Logging.Log4Net1211 by: Aleksandar Seovic Mark Pollack Erich Eichinger Stephen Bohlen

Common.Logging library bindings for Log4Net 1.2.11 logging framework.

Common.Logging.Log4Net1213 by: Aleksandar Seovic Mark Pollack Erich Eichinger Stephen Bohlen G. Stoynev

Common.Logging library bindings for Log4Net 1.2.13 logging framework.

ConfigR.Roslyn.CSharp by: Adam Ralph ConfigR contributors

Write your .NET configuration files in C# and execute them using Roslyn.

ConfigureAwait.Fody by: Cameron MacFarland Simon Cropp

Configure async code's ConfigureAwait at a global level.

Costura.Fody by: geertvanhorrik simoncropp

Fody add-in for embedding references as resources.

Crc32C.NET by: Robert Važan

Hardware-accelerated CRC-32C (Castagnoli) with super fast software fallback for .NET projects. Don't confuse with ordinary CRC-32. Automatically selects 32-bit or 64-bit embedded native library for maximum performance.

CredentialManagement by: iLya Lozovyy

Credential Management package is a wrapper for the Windows Credential Management API that supports both the old and the new style of UI

CS-Script by: Oleg Shilo

Class Library assembly for the CS-Script engine. CS-Script is a CLR (Common Language Runtime) based scripting system which uses ECMA-compliant C# as a programming language.

coverlet.msbuild by: tonerdo

Coverlet is a cross platform code coverage library for .NET, with support for line, branch and method coverage.

Coding4Fun.Toolkit.Controls by: Coding4Fun Hermit Dave

The Coding4Fun Toolkit has multiple controls and useful items for XAML based applications.

CloudinaryDotNet by: Cloudinary

Official client library for easily integrating with the Cloudinary service

CronExpressionDescriptor by: Brady Holt Renato Lima Ivan Santos Siarhei Khalipski Mustafa SADEDİL Star Peng TotalMace LbISS Arnaud TAMAILLON Michael Schuler Taras(tbudurovych) rinaldihno

A library that converts cron expressions into human readable descriptions. Supports 14 languages: English, Brazillian, Spanish, Norwgian, Turkish, Dutch, Chinese Simplified, Russian, French, German, Ukrainian, Polish, Romanian and Italian.

ConfigR by: Adam Ralph ConfigR contributors

Write your .NET configuration files in C# and other .NET languages. Fed up with XML soup? Frustrated that app settings can only be strings? Want to do more in your configuration file than just define app settings? Then ConfigR is for you!

CompareNETObjects by: KellermanSoftware

What you have been waiting for. Perform a deep compare of any two .NET objects using reflection. Shows the differences between the two objects.

CommonServiceLocator by: Microsoft

The Common Service Locator library contains a shared interface for service location which application and framework developers can reference. The library provides an abstraction over IoC containers and service locators. Using the library allows an application to indirectly access the capabilities without relying on hard references. The hope is that using this library, third-party applications and frameworks can begin to leverage IoC/Service Location without tying themselves down to a specific implementation.