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.

Dapper by: Sam Saffron Marc Gravell Nick Craver

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

DevDefined.OAuth by: Alex Henderson

The DevDefined.OAuth project is a library for creating both OAuth consumers and providers on the .Net Framework. It currently targets the .Net Framework 3.5 and above, and is written in C#.

DnsClient by: MichaCo

DnsClient.NET is a simple yet very powerful and high performance open source library for the .NET Framework to do DNS lookups

DotLiquid by: Tim Jones Alessandro Petrelli

DotLiquid is a templating system ported to the .NET framework from Ruby’s Liquid Markup.

DotNetCore.NPOI by: NCC Savorboard

A .NET library for reading and writing Microsoft Office binary and OOXML file formats.

DotNetCore.NPOI.Core by: NCC Savorboard

A .NET library for reading and writing Microsoft Office binary and OOXML file formats.

DotNetCore.NPOI.OpenXml4Net by: NCC Savorboard

A .NET library for reading and writing Microsoft Office binary and OOXML file formats.

DotNetCore.NPOI.OpenXmlFormats by: NCC Savorboard

A .NET library for reading and writing Microsoft Office binary and OOXML file formats.

Elasticsearch.Net by: Elastic and contributors

Exposes all the Elasticsearch API endpoints but leaves you in control of building the request and response bodies. Comes with built in cluster failover/connection pooling support.

ES.FX.Vies by: EmberStack.com

.NET client for the VIES - European Commission - VAT validation service

Flurl by: Todd Menier

A fluent, portable URL builder. To make HTTP calls off the fluent chain, check out Flurl.Http.

Flurl.Http by: Todd Menier

A fluent, testable HTTP client library.

Fractions by: Daniel Mueller

The fraction data type consists of two BigInteger values for numerator and denominator. It implements various operations (addition, subtraction, multiplication, division and remainder) with operator overloads.

GlobalPayments.Api by: Global Payments

API for processing payments through Heartland, Global Payments and Realex.

Google.Protobuf by: Google Inc.

C# runtime library for Protocol Buffers - Google's data interchange format.

HtmlAgilityPack.NetCore by: Zulfahmi Ahmad

Deprecated as there's new maintainer for original HAP project. Please check the new repo at https://github.com/zzzprojects/html-agility-pack. This is a port of HtmlAgilityPack library created by Simon Mourrier and Jeff Klawiter for .NET Core platform. This NuGet package supports can be used with Universal Windows Platform, ASP.NET 5 (using .NET Core) and full .NET Framework 4.6. Original description: This is an agile HTML parser that builds a read/write DOM and supports plain XPATH or XSLT (you actually don't HAVE to understand XPATH nor XSLT to use it, don't worry...). It is a .NET code library that allows you to parse "out of the web" HTML files. The parser is very tolerant with "real world" malformed HTML. The object model is very similar to what proposes System.Xml, but for HTML documents (or streams).

HtmlSanitizer by: Michael Ganss

Cleans HTML from constructs that can be used for cross-site scripting (XSS)

Humanizer by: Mehdi Khalili Claire Novotny

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

Humanizer.Core by: Mehdi Khalili Claire Novotny

Humanizer core package that contains the library and the neutral language (English) resources