Languages/QtSharp
Qt# is a set of classes that bind the C# language to the Qt toolkit. The bindings are in active development.
The Qyoto/Kimono project were SMOKE based bindings which use the mono C# compiler for use with Qt and KDE that are very similar to C++/Qt syntax but with the addition of the unique syntactic constructs of C#. Because .NET is a multi-language VM, a variety of languages should be able to access the bindings. The Qyoto binding is no longer in development.
Mono is an open source implementation of the .NET Development Framework.