Emacs

eglot

LanguageServer.jl can be easily used with eglot by installing the eglot-jl package from melpa. It provides:

• completion via completion-at-point
• signatures and help at point via eldoc and eglot-help-at-point
• Variable/function renaming eglot-rename
• Jump to function/type definition via xref-find-definitions
• Jump to symbols via imenu
• Automatic buffer formatting via eglot-format
• Linting via flymake-mode

lsp-mode

It is possible to use the Julia LanguageServer in Emacs using the lsp-mode and the lsp-julia packages. See the README of lsp-julia to get it working. It also might be helpful to look at this discourse post from @ffevotte to get an idea of the capabilities available.