PortfolioOptimisers.jl
I noticed Julia there was no comprehensive portfolio optimisation package, so I made one.
It has a huge number of features, many of them composable, so the world is your oyster. I’m still actively developing it, but the API should be fairly stable now.
I posted about it in package announcements, but you could equally just read the readme and visit the docs.
I hope it’s of interest to this sub-community.