I've been using H2O quite a bit at work, because it does a few things well (I mostly use it for random forest and GBM) and is easy to use.
I talked with the company at length about creating a Julia package and the company is supportive of open-source contributions, so I created a stump of a package. Anyone interested in working on it with me? Right now, I'm still in between about using PyCall for everything or attacking the API directly. Anyone interested in helping can help me derive a development plan... https://github.com/randyzwitch/H2O.jl
