BouncyCastle.Cryptography by: Legion of the Bouncy Castle Inc.

BouncyCastle.NET is a popular cryptography library for .NET

Castle.Core by: Castle Project Contributors

Castle Core, including DynamicProxy, Logging Abstractions and DictionaryAdapter

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.

CommonServiceLocator by: Microsoft.Practices.ServiceLocation

A simple facade that provides insulation from specific IoC containers

CommunityToolkit.HighPerformance by: Microsoft

This package includes high performance .NET helpers such as: - Memory2D<T> and Span2D<T>: two types providing fast and allocation-free abstraction over 2D memory areas. - ArrayPoolBufferWriter<T>: an IBufferWriter<T> implementation using pooled arrays, which also supports IMemoryOwner<T>. - MemoryBufferWriter<T>: an IBufferWriter<T>: implementation that can wrap external Memory<T>: instances. - MemoryOwner<T>: an IMemoryOwner<T> implementation with an embedded length and a fast Span<T> accessor. - SpanOwner<T>: a stack-only type with the ability to rent a buffer of a specified length and getting a Span<T> from it. - StringPool: a configurable pool for string instances that be used to minimize allocations when creating multiple strings from char buffers. - String, array, Memory<T>, Span<T> extensions and more, all focused on high performance. - HashCode<T>: a SIMD-enabled extension of HashCode to quickly process sequences of values. - BitHelper: a class with helper methods to perform bit operations on numeric types. - ParallelHelper: helpers to work with parallel code in a highly optimized manner. - Box<T>: a type mapping boxed value types and exposing some utility and high performance methods. - Ref<T>: a stack-only struct that can store a reference to a value of a specified type. - NullableRef<T>: a stack-only struct similar to Ref<T>, which also supports nullable references.

CommunityToolkit.Maui by: Microsoft

The .NET MAUI Community Toolkit is a collection of Animations, Behaviors, Converters, and Custom Views for development with .NET MAUI. It simplifies and demonstrates common developer tasks building iOS, Android, macOS and Windows apps with .NET MAUI.

CommunityToolkit.Maui.Core by: Microsoft

Core library for community toolkits using .NET MAUI

Confluent.Kafka by: Confluent Inc., Andreas Heider

Confluent's .NET Client for Apache Kafka

Confluent.Kafka.DependencyInjection by: Kyle McClellan

An extension of Confluent.Kafka for use with Microsoft.Extensions.DependencyInjection.

Confluent.Kafka.Extensions.Diagnostics by: Vadim Hatsura

Confluent.Kafka instrumentationusing the [System.Diagnostics.Activity](https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.activity) API

Confluent.Kafka.Extensions.OpenTelemetry by: Vadim Hatsura

OpenTelemetry instrumentation for Confluent.Kafka

ConsoleAppFramework by: Cysharp

Zero Dependency, Zero Overhead, Zero Reflection, Zero Allocation, AOT Safe CLI Framework powered by C# Source Generator.

coverlet.collector by: tonerdo

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

coverlet.msbuild by: tonerdo

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

Crc32.NET by: force

Fast version of Crc32 algorithm for .NET. It is up to 3x-5x times better than other "fast" implemenations. Code based on Crc32C.NET library.

CSharp by: CSharp Development Team

CSharp

CsQuery by: James Treworgy

CsQuery is a CSS selector engine and jQuery port for .NET 4 and C#. It implements all CSS2 and CSS3 selectors, all the DOM manipulation methods of jQuery, and some of the utility methods. It includes an HTML parser, a document object model that mimics the browser DOM, and uses a subselect-capable index for fast operation.

CsvHelper by: Josh Close

A library for reading and writing CSV files. Extremely fast, flexible, and easy to use. Supports reading and writing of custom class objects.

Cucumber.Messages by: Cucumber Ltd, TechTalk

JSON schema-based messages for Cucumber's inter-process communication

Dapper by: Sam Saffron, Marc Gravell, Nick Craver

A high performance Micro-ORM supporting SQL Server, MySQL, Sqlite, SqlCE, Firebird etc..