Cosmos Operating System

Cosmos is an open source operating system project that aims to be completely implemented in CIL compliant languages, that is currently 100% C#. It signifies everything that is important in Operating Systems: Universalization, Security, and Simplicity.

Design Overview

• Completely .NET based.
  
• Microkernel or close hybrid
  
• Configurable using modules
  
• Cross platform architecture

User Kit

Build your own shell, build and deploy in 30 seconds or less! See for yourself. The basic steps are:

1. Install Cosmos user kit
2. File, New, Cosmos Boot project from within Visual Studio.
   
3. Modify the entry point. The default project has just a WriteLine.
4. Run (F5). Cosmos will now build a boot disk and ask you what emulator to use. Press 3 to use included QEMU, or choose from VMWare, Virtual PC, ISO, PXE and more!

That is all you need to do! User kit tutorial.

Video Demo

Source :- http://www.gocosmos.org/index.en.aspx
http://www.codeplex.com/Cosmos
http://www.facebook.com/pages/Cosmos-Operating-System/102358427