JsonFx v2.0 - JSON serialization framework for .NET. It has unified interface for reading / writing JSON, BSON, XML, JsonML. It implements LINQ-to-JSON, Supports reading/writing using DataContract, XmlSerialization, JsonName, attributes and lot more.

JsonFx.NET - JSON serialization framework for .NET

Cake (C# Make) is a build automation system with a C# DSL to do things like compiling code, copy files/folders, running unit tests, compress files and build NuGet packages. Cake is built on top of the Roslyn compiler which enables you to write your build scripts in C#. It supports the most common tools used during builds such as MSBuild, MSTest, xUnit, NUnit, NuGet, ILMerge, WiX and SignTool out of the box. 

Cake - (C# Make) is a cross platform build automation system

The Microsoft Bot Framework provides just what you need to build and connect intelligent bots that interact naturally wherever your users are talking, from text/sms to Skype, Slack, Office 365 mail and other popular services.The Microsoft Bot Builder SDK is one of three main components of the Microsoft Bot Framework. It is a powerful, easy-to-use framework that provides a familiar way for .NET and Node.js developers to develop bots. 
 
The Bot Builder SDK provides features that make interactions between bots and users much simpler. Bot Builder also includes an emulator for debugging your bots, as well as a large set of sample bots you can use as building blocks.

The Microsoft Bot Framework provides just what you need to build and connect intelligent bots that interact naturally wherever your users are talking, from text/sms to Skype, Slack, Office 365 mail and other popular services.The Microsoft Bot Builder SDK is one of three main components of the Microsoft Bot Framework. It is a powerful, easy-to-use framework that provides a familiar way for .NET and Node.js developers to develop bots. 

BotBuilder - The Microsoft Bot Builder SDK is one of three main components of the Microsoft Bot Framework

The Marten library provides .NET developers with the ability to use the proven PostgreSQL database engine and its fantastic JSON support as a fully fledged document database. The Marten team believes that a document database has far reaching benefits for developer productivity over relational databases with or without an ORM tool.Marten also provides .NET developers with an ACID-compliant event store with user-defined projections against event streams.

Marten - Postgresql as a Document Database and Event Store for .Net Applications

Quasar is a fast and light-weight remote administration tool coded in C#. The usage ranges from user support through day-to-day administrative work to employee monitoring. Providing high stability and an easy-to-use user interface, Quasar is the perfect remote administration solution for you.

Quasar - Remote Administration Tool for Windows

GVFS stands for Git Virtual File System, It manages massive Git repositories possible. GVFS virtualizes the file system beneath your git repo so that git and all tools see what appears to be a normal repo, but GVFS only downloads objects as they are needed. GVFS also manages git's sparse-checkout to ensure that git operations like status, checkout, etc., can be as quick as possible because they will only consider the files that the user has accessed, not all files in the repo.
 
Git struggles to handle enterprise-scale repositories. Operations like cloning will slow to a crawl when you have millions of files in a repository, and even something as simple as getting your repository status will leave you waiting. GVFS was created by the Visual Studio Team Services team at Microsoft, specifically to deal with these scale issues for Microsoft's own codebases.

GVFS stands for Git Virtual File System, It manages massive Git repositories possible. GVFS virtualizes the file system beneath your git repo so that git and all tools see what appears to be a normal repo, but GVFS only downloads objects as they are needed. GVFS also manages git's sparse-checkout to ensure that git operations like status, checkout, etc., can be as quick as possible because they will only consider the files that the user has accessed, not all files in the repo.

GVFS - Git Virtual File System, Manages massive Git repositories

AngleSharp is a .NET library that gives you the ability to parse angle bracket based hyper-texts like HTML, SVG, and MathML. XML without validation is also supported by the library. An important aspect of AngleSharp is that CSS can also be parsed. The included parser is built upon the official W3C specification. This produces a perfectly portable HTML5 DOM representation of the given source code and ensures compatibility with results in evergreen browsers. Also standard DOM features such as querySelector or querySelectorAll work for tree traversal.

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

NSwag is a Swagger/OpenAPI 2.0 and 3.0 toolchain for .NET, .NET Core, Web API, ASP.NET Core, TypeScript (jQuery, AngularJS, Angular 2+, Aurelia, KnockoutJS and more) and other platforms, written in C#. The OpenAPI/Swagger specification uses JSON and JSON Schema to describe a RESTful web API. The NSwag project provides tools to generate OpenAPI specifications from existing ASP.NET Web API controllers and client code from these OpenAPI specifications.
 
The project combines the functionality of Swashbuckle (OpenAPI/Swagger generation) and AutoRest (client generation) in one toolchain (these two libs are not needed). This way a lot of incompatibilites can be avoided and features which are not well described by the OpenAPI specification or JSON Schema are better supported.

NSwag is a Swagger/OpenAPI 2.0 and 3.0 toolchain for .NET, .NET Core, Web API, ASP.NET Core, TypeScript (jQuery, AngularJS, Angular 2+, Aurelia, KnockoutJS and more) and other platforms, written in C#. The OpenAPI/Swagger specification uses JSON and JSON Schema to describe a RESTful web API. The NSwag project provides tools to generate OpenAPI specifications from existing ASP.NET Web API controllers and client code from these OpenAPI specifications.

NSwag - The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript

Managing large application state easily, resiliently, and with high performance is one of the hardest problems in the cloud today. The FASTER project offers two artifacts to help tackle this problem. 
 
FASTER Log is a high-performance concurrent persistent recoverable log, iterator, and random reader library in C#. It supports very frequent commit operations at low latency, and can quickly saturate disk bandwidth. It supports both sync and async interfaces, handles disk errors, and supports checksums.
 
FASTER KV is a concurrent key-value store + cache (available in C# and C++) that is designed for point lookups and heavy updates. FASTER supports data larger than memory, by leveraging fast external storage (local or cloud). It also supports consistent recovery using a fast non-blocking checkpointing technique that lets applications trade-off performance for commit latency.

Managing large application state easily, resiliently, and with high performance is one of the hardest problems in the cloud today. The FASTER project offers two artifacts to help tackle this problem. FASTER Log is a high-performance concurrent persistent recoverable log, iterator, and random reader library in C#. FASTER KV is a concurrent key-value store + cache (available in C# and C++) that is designed for point lookups and heavy updates.

FASTER - Fast persistent recoverable log and key-value store + cache, in C# and C++

PDFsharp is the Open Source .NET library that easily creates and processes PDF documents on the fly from any .NET language. The same drawing routines can be used to create PDF documents, draw on the screen, or send output to any printer. Neither Adobe's PDF Library nor Acrobat are required. Its features include:
 <ul><li>Creates PDF documents on the fly from any .NET language<1/li><li>Easy to understand object model to compose documents</li><li>One source code for drawing on a PDF page as well as in a window or on the printer</li><li>Modify, merge, and split existing PDF files</li><li>Images with transparency (color mask, monochrome mask, alpha mask)</li><li>Newly designed from scratch and written entirely in C#</li><li>The graphical classes go well with .NET </li></ul>

PDFsharp is the Open Source .NET library that easily creates and processes PDF documents on the fly from any .NET language. The same drawing routines can be used to create PDF documents, draw on the screen, or send output to any printer. Neither Adobe's PDF Library nor Acrobat are required.

PDFSharp - Create and process PDF in .NET

Json.NET is a popular high-performance JSON framework for .NET. It is serializes .NET objects to JSON. It converts JSON to LINQ, XML and lot more. It performs faster than .NET buit in serializers.

JSON.NET - JSON framework for .NET

Open Live Writer is an open source application enabling users to author, edit, and publish blog posts. It is based on a fork of the well-loved but not actively developed Windows Live Writer code.

OpenLiveWriter - Helps to write, preview, and post to your blog

Bonobo Git Server for Windows is a web application you can install on your IIS and easily manage and connect to your git repositories. It helps to manage users and have full control over your repositories with a user friendly graphical interface. It supports Repository browser, Commit browser, User and team based repository access etc.

Bonobo Git Server - Simple git server for Windows

DotNetty is a port of Netty, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

DotNetty - a port of netty, event-driven asynchronous network application framework

Shouldly is an assertion framework which focuses on giving great error messages when the assertion fails while being simple and terse.Shouldly uses the code before the ShouldBe statement to report on errors, which makes diagnosing easier.

Shouldly - Should testing for .NET - the way Asserting *Should* be!

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