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MimeKit
A cross-platform .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.

Portable.Licensing
Portable.Licensing is a cross platform software licensing framework which allows you to implement licensing into your application or library. It provides you all tools to create and validate licenses

TinyIoC
An easy to use, hassle free, Inversion of Control Container for small projects, libraries and beginners alike.

Metrics.NET
The Metrics.NET library provides a way of instrumenting applications with custom metrics (timers, histograms, counters etc) that can be reported in various ways and can provide insights on what is hap

LibLog
LibLog is a single file for you to either copy/paste or install via nuget, into your library/framework/application to provide a logging abstraction.

roundhouse
RoundhousE is a Database Migration Utility for .NET using sql files and versioning based on source control

Polly
Polly is a .NET 3.5 / 4.0 / 4.5 / PCL library that allows developers to express transient exception and fault handling policies such as Retry, Retry Forever, Wait and Retry or Circuit Breaker in a flu

Nancy
Lightweight, low-ceremony, framework for building HTTP based services on .Net and Mono

AngleSharp
:angel: The ultimate angle brackets parser library parsing HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specifications.

Hangfire
An easy way to perform background processing in your .NET and .NET Core applications

opencover
A code coverage tool for .NET 2 and above (WINDOWS OS only), support for 32 and 64 processes with both branch and sequence points

Humanizer
Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities

impromptu-interface
Static interface to dynamic implementation (duck casting). That and more using the DLR.

ServiceStack
Thoughtfully architected, obscenely fast, thoroughly enjoyable web services for all

fluent-command-line-parser
A simple, strongly typed .NET C# command line parser library using a fluent easy to use interface

couchbase-lite-net
A lightweight, document-oriented (NoSQL), syncable database engine for .NET

AutoFixture
AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on wha

fluentassertions
Fluent Assertions is a set of .NET extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style test. We currently use it in all our internal and client projec

msbuildtasks
The MSBuild Community Tasks Project is an open source project for MSBuild tasks.

Rebus
:bus: Rebus is a lean service bus implementation for .NET, similar in nature to NServiceBus and MassTransit, only leaner.
