HTML++
Object-oriented generation of HTML code on .NET 4 Client Profile
This library allows you to generate HTML pages directly from your code in a strongly typed, compositional, safe and concise manner. Requires the .NET Framework 4 Client Profile only.
It is licensed under LGPL, which means that you may use it in commercial products. The project logo is from Mariano Real, who kindly provided it under a Creative-Commons license.