Alternative and related packages

- https://github.com/JuliaImages/ImageMorphology.jl (general image morphology)
- https://github.com/emmt/LocalFilters.jl (fast mapwindowed operations)
- https://github.com/rafaqz/Stencils.jl (custom mapwindowed kernels)
- https://github.com/hellemo/FastMarching.jl (for spread, cost distance)