Who would believe that there would be an open source CMS based on Microsoft's ASP.NET? A CMS that can support any modern browser and that even allows editing with Microsoft Word. One where designers can create accessible and valid xhtml with their markup left intact. Where developers can integrate any .net based control right out of the box. If someone tells you "won’t happen", then they have never used umbraco...

What is Umbraco?

umbraco is an open source project with roots back to year 2000 even though it wasn't released as open source until 2004. Prior to that it was founder Niels Hartvig's home-grown weapon of choise for working as a freelancer.

Today it has grown to be among the top fifteen most popular open source .NET applications and in May 2008 it hit a milestone at 50.000 installed and active websites (double up from 25.000 in April 2007).

umbraco is a registered trademark of Niels Hartvig.

Umbraco Team

umbraco was founded and is owned by Niels Hartvig, but is made possible by loads of individuals helping out and the core team who's doing the development.

Niels Hartvig, Founder & architect

As the original brain behind umbraco, I'm in charge of development and application/experience design. My primary roles in the project are the contentious development of the umbraco platform and thinking about how umbraco should work and act in the future.
You can read my thoughts at my weblog hartvig.com

MVPs 2008/2009 (Most Valued Persons):

    *     Casey Neehouse
    *     Warren Buckley
    *     Douglas Robar
    *     Morten Bock
    *     Tim Geyssens
    *     Paul Sterling
    *     Dirk De Grave

Sites running on Umbraco CMS
Umbraco CMS currently powers more than 75.000 websites world wide. Enjoy just a fragment of these sites below and explore what the most flexible open source CMS on the Microsoft platform is capable of.

1. Heinz.com
2. Wired.co.uk
3. ABBA Official Site 

For more please visit: http://umbraco.org/tour/sites-running-umbraco

Liscense:

Covers files in the distribution, except the umbraco.dll and files in the /umbraco folder. However, the umbraco.library class in the umbraco.dll is also covered by this (MIT) license

Copyright (c) 2007 umbraco I/S

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

>Umbraco UI Licence:

Covers files in the /umbraco folder and the umbraco.dll except for the umbraco.library class (which is covered by the license above - MIT).

The Umbraco UI Licence below applies to the Umbraco UI software version 3.

Any version of the Umbraco UI software prior to version 3 is not covered by this licence. Please refer to the licence document in such prior versions of the Umbraco UI software to find the relevant licence information.

Please note, that regarding the Umbraco Framework the Umbraco Framework licence applies. Please also note that for the Umbraco UI the Umbraco UI Commercial Licence is also available.

The Licence

The Umbraco UI software is copyright (c) 2007 Umbraco I/S, Vesterbrogade 50, 1620 Copenhagen V, Denmark.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software, including the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. To the extent the Software contains the Umbraco name, trademark, brand and/or the Umbraco logo, any copy, modification, merger, publication, distribution or equivalent use of the Software shall retain any such names, trademarks, brand and/or logos intact. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGE OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Any non-compliance with this licence agreement is to be considered a full and unconditional agreement of the Umbraco UI Commercial Licence. Any dispute which may arise between the parties, concerning this licence and/or use of the software, is to be brought before the Danish courts at the venue of Umbraco I/S. This licence shall be governed and construed in accordance with the laws of the Kingdom of Denmark.