The Julia Einstein Characteristic Code (Jecco; ['ʒɛku]) provides tools to solve Einstein's equations in the characteristic formulation in Julia.
This package is not in the registry. You can install it by specifying the URL to the repository:
pkg> add https://github.com/mzilhao/Jecco.jl/
julia> using Jecco, Jecco.AdS5_3_1