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RadEditor for ASP.NET AJAX
A couple of words about the formula editor - it uses a Java applet so be sure to have the Java plugin installed in your browser. We used the basic ASPX demo that WIRIS offers as a base for our integration example. The demo can be seen here - http://www.wiris.eu/demo-aspx/pluginwiris/generic/. There are two editors that we converted to custom dialogs - a formula editor and a CAS (Computer Algebra System). We made a number of changes to the basic demo. and converted it to a proper ASP.NET website using .NET 3.5 (it was originally using .NET 1.0).
Here is a screenshot of the demo: