JSNLog by: Mattijs Perdeck

JavaScript logging package that lets you log exceptions, AJAX timeouts and other client side events in your server side log. Supports .Net Core 2.0+ only. For ASP.NET 4.x (.Net 4.5.2+), install version 2.30.0 of this package.

JSNLog.Log4Net by: Matt Perdeck

Log JavaScript errors and other client side events in your Log4Net server side log. Installs JSNLog and configures it for use with Log4Net. Use with ASP.NET 4.x.

JsonSubTypes by: Emmanuel Counasse

Discriminated Json Subtypes Converter implementation for .NET

K4os.Compression.LZ4 by: Milosz Krajewski

Port of LZ4 compression algorithm for .NET

K4os.Compression.LZ4.Streams by: Milosz Krajewski

Port of LZ4 compression algorithm for .NET

K4os.Hash.xxHash by: Milosz Krajewski

xxHash hash implementation for .NET

knockoutjs by: The Knockout.js team

A JavaScript MVVM library to help you create rich, dynamic user interfaces with clean maintainable code

KRE-CLR-x86 by: Microsoft

The K Runtime Environment for Desktop CLR x86

KRE-CoreCLR-x86 by: Microsoft

The K Runtime Environment for CoreCLR x86

LazyCache by: https://github.com/alastairtree

Lazy cache is a simple, thread safe, in-memory caching library that makes it easy to add high performance caching to your dotnet app.

LibSassBuilder by: Johan van Rensburg

Compile Sass files to css on project build.

Libuv by: Libuv

Multi-platform support library with a focus on asynchronous I/O.

LinqBridge by: Atif Aziz

With Visual Studio's multi-targeting and LINQBridge, you can write LINQ to Objects (local) queries using the full power of the C# 3.0 compiler and yet create programs that require only Microsoft .NET Framework 2.0. LINQBridge is a re-implementation of all the standard query operators introduced with Microsoft .NET Framework 3.5's System.Linq.Enumerable class.

LinqKit.Core by: Joseph Albahari Tomas Petricek Scott Smith Tuomas Hietanen Stef Heyenrath

LinqKit.Core contains extensions for LINQ to SQL and Entity Framework. Note that Include(...), IAsync and IDbAsync are not supported.

LiteX.HealthChecks.AzureKeyVault by: Ashish Patel

AzureKeyVault health checks package used to check the status of a Azure KeyVault service in .NET 5, .NET Core, .NET Standard based applications. LiteXHealthChecks is very small yet powerful and high-performance library used to check the status of a component in the application, such as a backend service, database or some internal state.

LiteX.HealthChecks.AzureServiceBus by: Ashish Patel

AzureServiceBus health checks package used to check the status of a Azure ServiceBus (queue and topic) in .NET 5, .NET Core, .NET Standard based applications. LiteXHealthChecks is very small yet powerful and high-performance library used to check the status of a component in the application, such as a backend service, database or some internal state.

log4net by: The Apache Software Foundation

log4net is a tool to help the programmer output log statements to a variety of output targets. In case of problems with an application, it is helpful to enable logging so that the problem can be located. With log4net it is possible to enable logging at runtime without modifying the application binary. The log4net package is designed so that log statements can remain in shipped code without incurring a high performance cost. It follows that the speed of logging (or rather not logging) is crucial. At the same time, log output can be so voluminous that it quickly becomes overwhelming. One of the distinctive features of log4net is the notion of hierarchical loggers. Using these loggers it is possible to selectively control which log statements are output at arbitrary granularity. log4net is designed with two distinct goals in mind: speed and flexibility

Magick.NET.Core by: Dirk Lemstra

ImageMagick is a powerful image manipulation library that supports over 100 major file formats (not including sub-formats). With Magick.NET you can use ImageMagick without having to install ImageMagick on your server or desktop. Visit https://github.com/dlemstra/Magick.NET/tree/main/docs before installing to help you decide the best version.

MailChimp.Net.V3 by: Brandon Seydel

A .NET Wrapper for Mail Chimp v3.0 API

ManagedEsent by: Microsoft

ManagedEsent provides managed access to ESENT, the embeddable database engine native to Windows. ManagedEsent uses the esent.dll that is part of Microsoft Windows so there are no extra unmanaged binaries to download and install.