OzCode a debugging Visual Studio Extension for .NET Developers, which complements Visual Studio and supercharges the C# debugging experience for .NET developers. Unlike existing debugger tools, OzCode is the only productivity solution that helps developers fix bugs quickly, accelerating and improving day-to-day debugging work in Visual Studio - delivering a premium bug-free environment for ASP.NET developers.

Orion supports several licensing scenarios with one solution and one application integration. These include:
* Network License Server
* Internet License Server
* Product Activation Server

A .NET class library for OPML ( Outline Processor Markup Language ) providing a set of .NET components which will quickly enable your server or desktop .NET application to read, create, merge and support OPML documents or files. The components are designed to support the Windows RSS Platform and import/export option of IE7. Written in pure C#, the OPML Library for .NET is fully managed and incredibly fast. The Library is completely object-oriented and the easiest way to add OPML importing and document handling to your .NET applications. OPMLLibrary for .NET fully supports OPML version 1.0 and the draft 2.0 protocols.

Open Twebst is an open source web automation framework + web recorder for Internet Explorer that can be used within any environment that supports COM, from scripting languages JScript, VBScript to higher level programming languages C#, VB.Net, VBA/Excel, C++.

The Schneider Software OOP-DIFF is a file diff tool for software developers. The tool understands the basic structure of a programming languages (C# and VB.NET so far). This makes comparing many refactorings or other codes changes much easier. The tool compares at logical code sections like methods and classes so order does not matter. The specific file parser is plugin based so it can support most languages. The tool requires parsing the actual source code, so there are probably variations of syntax not yet supported.

Companies should put a question if they are ready to loose competitive ability using inaccurate data or apply progressive technology. For those who are eager to increase the efficiency by applying such a technology Perpetuum Software offers OLAP ModelKit. In addition to common functionality inhered by the existing OLAP components such as accuracy and easiness of data analysis, ability for creating and treating alternative relations etc. OLAP ModelKit has its own particularities. The product is fully compatible with .NET due to 100% managed code. This component has an XP Themed appearance and an ability to use any .NET data sources (including ADO.NET and IList). OLAP ModelKit supports nested data sources. Now there is no need to prepare a special data access meeting the required calculations. This library is intended for creating and utilizing cross reports based on multiple statistical data of large volumes. Moreover, OLAP ModelKit provides an opportunity to represent the final report data not only as a table; it also allows organizing the information so to make it available for use by third party chart components. It should be mentioned such features as comprehensible User Interface. Now end users have an ability of data filtering, drilling down, rolling up, dimensional pivoting, ranking. The product allows embedding OLAP technology in all Windows applications based on relational data.

ODS is an automatic database and DAL source code generation tool aimed at .NET Framework 2.0+ software developers who want a custom database and DAL to use with their application. Rather than using an existing database, ODS allows you to design the objects that you want to store. ODS then automatically designs both a database to store them in and generates a corresponding DAL.

NUnit is an open source unit testing framework for Microsoft .NET. It serves the same purpose as JUnit does in the Java world, and is one of many in the xUnit family.

NSubstitute is an open source .NET mocking framework. NSubstitute is designed for Arrange-Act-Assert (AAA) testing, so you just need to arrange how it should work, then assert it received the calls you expected once you're done. Because you've got more important code to write than whether you need a mock or a stub.

Specify is a Behavior-Driven Development Framework developed in C#.NET.