FWIW, there is a Julia library that allows you to call out to R (https://github.com/lgautier/Rif.jl). I'm not sure how well-developed it is though. There are also a lot of R-inspired Julia libraries, such as Dataframes (https://github.com/JuliaStats/DataFrames.jl).

There is also a pretty good Julia-Python interface (https://github.com/stevengj/PyCall.jl) and bindings to Matplotlib (https://github.com/stevengj/PyPlot.jl).