Qyoto makes it possible to develop Qt and KDE applications using C#, or any other .NET language. Qyoto uses SMOKE, and offers access to almost all Qt and KDE classes.
Qyoto is part of the kdebindings module in the KDE SVN repository.
$ git clone git://anongit.kde.org:qyoto
You can also browse the source online.
Pre-built binary packages are available in the following distributions: