Argon Network Switcher is a network configuration switcher.,

Application Message Bus for .Net - asynchronous publish-subscribe message bus based on SQL server and similar to other service bus projects like NServiceBus or MassTransit.
Features:
- messages stored in SQL database
- publish-subscribe message distribution...

Command-line utility for converting XNA XNB files.

• Converting Texture2D XNB files to PNG images.
• All versions of XNA are supported: 1.0, 2.0, 3.0, 3.1, 4.0.

Specter is an object-behaviour specification framework for .NET.
It enables behaviour-driven development by requiring developers to write executable specifications for their objects, before actually implementing them.
Technologically this is similar to test driven development, however the shift in nomenclature removes the psychological barrier of writing "tests" for code that does not exist. (Existing projects implementing this idea include RSpec for Ruby and NSpec for .NET)...

Cosmos (C# Open Source Managed Operating System) is an operating system project implemented completely in CIL compliant languages.

TMake is a fast, lightweight, yet very powerful Build System. You can use TMake to build projects, or create new ones.

- C, C++, C# (including mono), Java and Go Compilers
 - Over 100 different packages
 - C and C++ Dependency Checking
 - Very fast
 - Uses for Lua for plain and simple build scripts...

The Alexandria Media Library is a media application that allows users to catalog, tag and play all common media types. Search is fast and users can create and share playlists of their favorites. It is written in C# and supports plugins for extending and adapting the built-in features....

IRC.NET is a fully-featured IRC (Internet Relay Chat) client library for the .NET Framework 4.0. It aims to provide a complete and accurate implementation of the protocol as described in RFC 2812 (Internet Relay Chat: Client Protocol) as well as supporting de-facto modern features of the protocol, such as ISUPPORT commands and CTCP (Client To Client Protocol)....

Open Rails is a train simulator project based on Microsoft XNA game studio. Open Rails is not an improvement to MSTS, but a complete new game platform that can read MSTS routes, activities, consists, and train sets. It currently uses the MSTS entries in the Windows registry to locate where your MSTS files are on your computer to read them into the Open Rails game engine. Open Rails does not utilize or change any original Microsoft Train Simulator code. Open Rails will eventually be a completely stand-alone sim, once suitable utilities have been developed for it....

Box Social is a piece of free and open source social networking software written in c# for the mono platform.