DB Shell is toolkit for automation of sQL Server database operations. It uses XAML subset of XML language, so there are many editors allowing comfortably edit DB shell code.

ShareCoffee is a lightweight library for creating SharePoint Apps. It’s fully written in CoffeeScript by using Mocha, Chai and SinonJS.

Effort is a powerful tool that enables a convenient way to create automated tests for Entity Framework based applications. It is basically an ADO.NET provider that executes all the data operations on a lightweight in-process main memory database instead of a traditional external database. It provides some intuitive helper methods too that make really easy to use this provider with existing ObjectContext or DbContext classes. A simple addition to existing code might be enough to create data driven tests that can run without the presence of the external database.

xUnit.net is a free, open source, community-focused unit testing tool for the .NET Framework. Written by the original inventor of NUnit v2, xUnit.net is the latest technology for unit testing C#, F#, VB.NET and other .NET languages. Works with ReSharper, CodeRush, and TestDriven.NET.

A set of controls and styles converting your WPF application into a great looking Modern UI app. This open source project is a spin-off of XAML Spy, the visual runtime inspector for Silverlight, Windows Phone, Windows Store and WPF. Read the announcement at xamlspy.com.

IronPigeon is a decentralized communication protocol that provides high confidentiality and authenticity for the messages.

dotConnect for DB2 is an enhanced ORM enabled data provider built on ADO.NET technology, that allows developers to easily integrate DB2 data with widely used data-oriented technologies and use them in .NET applications. dotConnect for DB2 offers a number of benefits over the standard provider.

Mantle is a framework for building massively scalable .NET-based applications that can be hosted either on-premises or on a variety of public cloud providers including Microsoft Azure and Amazon AWS.

Chocolatey NuGet is a Machine Package Manager, somewhat like apt-get, but built with Windows in mind.

LINQ Insight is a Visual Studio add-in that allows to execute LINQ queries at design-time directly from Visual Studio without starting a debug session, allowing you to test queries instantly after you write them. LINQ Insight also provides a powerful ORM Profiler tool for profiling the data access layer of your projects and tracking all the ORM calls and database queries from the ORM. LINQ Insight integrates into Visual Studio 2010, 2012 and 2013. Entity Framework 6 is now supported in the latest version of the product.