This tag refers to the Ektron CMS400.NET content management system.
Ektron is a privately held software company based in Nashua, New Hampshire. It provides web content management and customer experience management software. Ektron's primary product is Ektron Web Content Management, formally "Ektron CMS400.NET" which is an enterprise-level content management solution. It is built on the Microsoft .NET Framework. Version 9.0 was released June 28, 2013, with multiple point releases.
Ektron was founded in 1998. Its original product was eWebEditPro, a browser-based HTML editor. Ektron entered the content management market in the early 2000s with the release of CMS100 and CMS200. It moved to the Microsoft .NET platform with the release of CMS400.NET in 2003.
More details can be found at the product page below:
http://www.ektron.com/Products/Web-CMS/Web-Content-Management/ http://en.wikipedia.org/wiki/Ektron