The Julia ecosystem contains over 4,000 packages that are registered in the General registry, which means that finding the right package can be a challenge. Fortunately, there are services that can help navigate the ecosystem, including:
Julia Observer — see what packages are popular and/or trending, navigate by package categories.
Julia Packages — browse Julia packages, filter by categories, and sort them by popularity, creation date or date of last update. Also supports browsing package developers.
Julia.jl — a manually curated taxonomy of Julia packages (category information for JuliaPackages is derived from this as well).