We posted a draft of a new package that performs multivariate interpolation on a rectilinear grid. At the moment, it provides implementations of multilinear and simplex interpolation.
https://github.com/sisl/GridInterpolations.jl We have not registered the package with METADATA.jl (hoping to get an initial round of feedback), so you'll have to clone it manually for now as mentioned in the README to play with it. There are other interpolation packages out there (e.g., Grid.jl), but this package focuses on multidimensional grids with non-uniform cutpoints along each dimension. It also supports simplex interpolation (I don't think any of the other Julia implementations do this).
