eStreamChat is a ASP.NET based software for creating online chat rooms and adding instant messenger functionality to your sites. The software is written in C# and is designed with scalability in mind.
Official site: http://www.estreamchat.com
The software is being tested in the latest versions of Chrome, Firefox and IE8+
eStreamChat uses ASP.NET 4.0
Dual licensed under AGPL and Commercial License http://www.estreamchat.com/license.aspx