Though judging by their repositories activity, they seem abandoned OCaml version and thrown all resources to the C#/.NET version
Well, this is the problem with OCaml. When 0install was written in Python, I did frequent bug-fix releases. Now it’s in OCaml, there’s no need to do that. e.g. there were 8 Python releases in 2012 vs 1 OCaml release last year. I prefer it that way, but it’s bad for the project’s metrics.
There is no directing of resources. Bastian Eicher did the C# version before and is still doing it now (though more of it is now hosted in the main github org and we just merged the two sets of documentation to make http://docs.0install.net/).