Just kernel level, or partial state projects that were abandoned.

D - Xomb - http://wiki.xomb.org/index.php?title=Main_Page

Go - TinyGo - http://code.google.com/p/tinygo/

C# - Singularity - http://singularity.codeplex.com/, Cosmos - http://cosmos.codeplex.com/

The main problem is lack of support, it is a very big effort to create an OS and it is very easy to turn attention to other stuff.

Linux and BSD distributions wouldn't have reached the state they enjoy nowadays, without the help of the existing UNIX toolset and investment of companies interested in seeing the projects succeed.

Responding to pjmlp, a cool project I saw recently that's related to the ones you mentioned is Unikernels [1]. They noticed that a challenge faced by a lot of those projects is hardware support--each OS has to ship with a huge set of drivers to be widely usable. They sidestep this by targeting a VM, which exposes a single hardware interface no matter what it's running on.

[1]: http://anil.recoil.org/papers/2013-asplos-mirage.pdf