Racket is s-expression based, so it has a lot of parentheses. Racket can claim to have slightly fewer parentheses than most other Lisps because it uses brackets in some places rather than parentheses.[1]

Rhombus is a novel notation (that is implemented as a Racket macro) which eliminates the need for almost all parentheses. They have a handful of code snippets on their homepage.

[1] Racket doesn't distinguish between parentheses and brackets, so programs could be paren-free. In practice, brackets are only used in a few key places: https://docs.racket-lang.org/reference/if.html#%28form._%28%...