Ardalis.GuardClauses by: Steve Smith (@ardalis)

A simple package by @ardalis and @nimblepros with guard clause helper methods. See docs for how to extend using your own extension methods defined in your project.

AngleSharp.Wrappers by: Egil Hansen

A library of wrappers for AngleSharp. Allows you to replace a real AngleSharp DOM tree but still keep the queried/returned node references. Built for and used by https://github.com/bUnit-dev/bUnit.

Accord by: Accord.NET

The core of the Accord.NET Framework. Contains basic classes such as general exceptions and extensions used by other framework libraries.

AspNetCore.ReCaptcha by: Michaelvs97, sleeuwen

Google ReCAPTCHA v2/v3 Library for .NET 6 and above

AspectInjector by: Aspect Injector Contributors

Attributes-based compile-time AOP framework. Cross-cutting concerns made easy! Just apply your attributes where you need them and everything automagicaly works! No xml configs! No wierd reflection hacks! No runtime emit! Works with AOT and Blazor! See release notes for this version here: https://github.com/pamidur/aspect-injector/releases/tag/2.9.0

Acr.UserDialogs by: Allan Ritchie

A cross platform library that allows you to call for standard user dialogs from a shared/portable library. Supports Android, iOS, and UWP

Antlr by: Sam Harwell, Terence Parr

ANother Tool for Language Recognition, is a language tool that provides a framework for constructing recognizers, interpreters, compilers, and translators from grammatical descriptions containing actions in a variety of target languages.

Ardalis.Specification by: Steve Smith (@ardalis), Fati Iseni (@fiseni), Scott DePouw

A simple package with a base Specification class, for use in creating queries that work with Repository types.

Allure.Net.Commons by: Alexander Bakanov, Nikolay Laptev, Maksim Stepanov

Provides common facilities to build Allure adapters for .NET test frameworks.

AngleSharp.Diffing by: AngleSharp

Provides a complete diffing model of HTML.

AngleSharp by: AngleSharp

AngleSharp is the ultimate angle brackets parser library. It parses HTML5, CSS3, and XML to construct a DOM based on the official W3C specification.

Ardalis.Specification.EntityFrameworkCore by: Steve Smith (@ardalis), Fati Iseni (@fiseni), Scott DePouw

EF Core plugin package to Ardalis.Specification containing EF Core evaluator and abstract repository.

Antlr3.Runtime by: Sam Harwell, Terence Parr

The runtime library for parsers generated by the C# target of ANTLR 3. This package supports projects targeting .NET 2.0 or newer, and built using Visual Studio 2008 or newer.

Accord.Video by: Accord.NET

Contains interfaces and classes to access different video sources, such as IP video cameras (MJPEG streams). This package originated from the AForge.NET Framework and is part of the Accord.NET Framework.

AspNetCore.HealthChecks.NpgSql by: Xabaril Contributors

HealthChecks.NpgSql is a health check for Postgress Sql.

Acornima by: Adam Simon

A standard-compliant JavaScript parser, which is a fork of Esprima.NET combined with the .NET port of the acornjs parser.

AngleSharp.Css by: AngleSharp.Css

Extends the CSSOM from the core AngleSharp library.

AsyncFixer by: Semih Okur

AsyncFixer detects common async/await anti-patterns and, when possible, offers automatic fixes. It currently reports 6 categories of async/await misuse and provides code fixes for 3 of them. It has been validated against thousands of open-source C# projects and is designed to handle tricky real-world edge cases. Tool-friendly diagnostics support AI-assisted workflows even when a built-in code fix is not available.

AnyAscii by: Hunter WB

Unicode to ASCII transliteration

AdvancedStringBuilder by: Andrey Taritsyn

Contains a simple implementation of the pool and extension methods for string builder.