On this page:
1 Racket mode
2 Emacs preview inspired by AUCTe  X

Emacs

1 Racket mode

I use racket-mode.

I find it useful to disable smart bracket completion, because it does not play well with typesetting formulas. This requires some lines in my ‘Emacs‘ file:

(define-key racket-mode-map (kbd "]") nil)
(define-key racket-mode-map (kbd ")") nil)
(define-key racket-mode-map (kbd "}") nil)

2 Emacs preview inspired by AUCTeX

The additional library bystroTeX-preview.el provides some rudimentary preview functionality similar to AUCTeX.

For example, see my .emacs file (search for racket-mode).