Cilador Weaver v0.1.1, a Fody addin for writing custom mixins in C#, is now available via NuGet and direct source and binary download. If you're a C# developer, please test it and provide feedback :-)
Cilador Weaver was formerly known as Bix.Mixers
 As indicated by its < 1.0 version number, this is still pre-release software. I have tested it as well as I can, but I make no guarantees that everything works perfectly. Breaking changes could also occur between minor versions. (I'll try not to do that, but it's better to do it sooner than later.) Use it in production at your own risk. However you use it, though, I'm interested in hearing about it!