SpectralDensities.jl is a package that defines commonly used spectral densities for Open Quantum Systems and typical operations on them.
To install the latest stable release of SpectralDensities.jl, you can use Julia's built-in package manager.
From the Julia interpreter press the ] key and run
pkg> add SpectralDensitiesAlternatively, you can import the Pkg package and call add from it
using Pkg;
Pkg.add("SpectralDensities")