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Cake (C# Make) is a cross platform build automation system. http://cakebuild.net/

Write C# apps with a text editor, nuget and the power of Roslyn! http://scriptcs.net

The easy mocking library for .NET http://fakeiteasy.github.io

A BDD/TDD framework based on xUnit.net and inspired by Gherkin. http://xbehave.github.io/

Incredibly simple real-time web for .NET http://signalr.net

A Git/TFS bridge, similar to git-svn http://git-tfs.com/

Exceptionless server and jobs http://exceptionless.com

This repo contains the .NET Core foundational libraries, called CoreFX. It includes classes for collections, file systems, console, XML, async and many others. http://dotnet.github.io/

Simple .NET logging with fully-structured events http://serilog.net

Excel-DNA - Free and easy .NET for Excel. This repository contains the core Excel-DNA library. https://excel-dna.net

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

Lightweight, low-ceremony, framework for building HTTP based services on .Net and Mono http://nancyfx.org

A GitHub API client library for .NET

Reddit API for .NET

The open source diagnostics platform for the web http://getGlimpse.com

Thoughtfully architected, obscenely fast, thoroughly enjoyable web services for all https://servicestack.net

The code that powers Voat https://voat.co

Official mirror of the AWS SDK for .NET. For more information on the AWS SDK for .NET, see our web site: http://aws.amazon.com/sdkfornet/

A computational geometry and math library for the CLR with potential medical, gaming, and GIS uses. http://mediocresoft.com/vertesaur

C# Client Library for SparkPost Email Service

Pluggable foundation blocks for building distributed apps.

Home finance management

The Url Tracker for Umbraco

An ultra light-weight dependency injection container built around the power of factories.

The open-source, functional database with Complex Event Processing in JavaScript. https://geteventstore.com

A friendly substitute for .NET mocking frameworks. http://nsubstitute.github.com