You might be interested in ExponentialUtilities.jl then. Julia has a really unique ability to make high performance linear algebra look like the math. See https://github.com/SciML/ExponentialUtilities.jl (specifically src/kiops.jl and src/krylov_phiv.jl) for an example of a good matrix exponential operator in ~600 lines of code+comments.
When did you look and what tooling was missing? Julia's package manager Pkg was pretty heavily inspired by cargo, and IMO it does a very good job. Also in the past 2-3 years Juliaup (modeled after rustup) has become the primary way of installing and managing Julia versions
