[cabernal]

Given that Racket isn’t backed by a big institution I don’t think you’ll find better IDE than DrRacket, which is pretty powerful it just doesn’t look great.

Alternatively, as is the case with most lisp/scheme variants, emacs has pretty good support OR you can try the LSP extension for VSCode.

[andrewflnr]

It's not just looks. I've only used it a bit, but there are definitely some rough edges function-wise.