I haven't used Julia's Juno yet, but have used Python's Spyder and found the combination of editor, REPL, variable inspector, and documentation pane to be great

I haven't used Julia's Juno yet, but have used Python's Spyder and found the combination of editor, REPL, variable inspector, and documentation pane to be great. I can't remember if Spyder can also show charts or if that has to come from the code itself if that makes sense.