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.

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.

AWSSDK.Core by: Amazon Web Services

The Amazon Web Services SDK for .NET - Core Runtime

Automatonymous by: Chris Patterson

Automatonymous is a state machine library for .NET

Atlassian.SDK by: Federico Silva Armas

Utilities to interact with Atlassian products. Contains LinqToJira provider for querying JIRA Issue tracker (http://www.atlassian.com/software/jira).

AsyncUsageAnalyzers by: Sam Harwell et. al.

A collection of analyzers related to best practices for writing asynchronous code.

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

AsyncBridge by: Daniel Grunwald, Omer Mor, Alex Davies

Adds the new C#5 async features for .NET 4 and .NET 3.5 projects

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.

AutoMapper by: Jimmy Bogard

A convention-based object-object mapper. AutoMapper uses a fluent configuration API to define an object-object mapping strategy. AutoMapper uses a convention-based matching algorithm to match up source to destination values. Currently, AutoMapper is designed for model projection scenarios to flatten complex object models to DTOs and other simple objects, whose design is better suited for serialization, communication, messaging, or simply an anti-corruption layer between the domain and application layer.

AWSSDK.SQS by: Amazon Web Services

Amazon Simple Queue Service (SQS) is a fast, reliable, scalable, fully managed message queuing service. SQS makes it simple and cost-effective to decouple the components of a cloud application.

Autofac by: Autofac Contributors

Base assemblies for the Autofac Inversion of Control Container

Ardalis.Specification by: Steve Smith (@ardalis), 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 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.

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.

BCrypt.Net-Next by: Chris McKee, Ryan D. Emerl, Damien Miller

A fixed, enhanced and namespace compatible version of BCrypt.Net port of jBCrypt implemented in C#. It uses a variant of the Blowfish encryption algorithm’s keying schedule, and introduces a work factor, which allows you to determine how expensive the hash function will be, allowing the algorithm to be "future-proof".

AWSSDK.SecurityToken by: Amazon Web Services

The AWS Security Token Service (AWS STS) enables you to provide trusted users with temporary credentials that provide controlled access to your AWS resources.

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.

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.