Released recently;
http://google-opensource.blogspot.co.uk/2015/02/mapreduce-for-c-run-native-code-in.html

Looks like it doesn't need a special compiler or anything.  Is there anything beyond needing to port C API that means one couldn't use it with D?  Any reason why it wouldn't be something one could find quite useful ?

I can't type much at the moment so not in a position to try.