Gauche also had sandbox module used for web framework Kahua.

(The development of Kahua has stopped and the main site has been shutdown, so we only have source repo:  https://github.com/kahua/Kahua

The sandbox module is https://github.com/kahua/Kahua/blob/master/src/kahua/sandbox.scm )

On Thu, Jul 18, 2019 at 3:27 AM Lassi Kortela <xxxxxx@lassi.io> wrote:

(require racket/sandbox)

"The racket/sandbox module provides utilities for creating “sandboxed”
evaluators, which are configured in a particular way and can have
restricted resources (memory and time), filesystem and network access,
and much more. Sandboxed evaluators can be configured through numerous
parameters"

<https://docs.racket-lang.org/reference/Sandboxed_Evaluation.html>