Racket has packages (1) that work quite well. Chicken Scheme has Eggs.

(1) https://docs.racket-lang.org/pkg/index.html

Eggs? Goodness. And I believe Chicken is R5RS as well, so I don't know what they call libraries/modules/packages/whatever (in R6RS and R7RS they're called libraries, but R5RS didn't specify anything). I expect Racket to call them libraries considering the Racket/R6RS connections.