I’d say Racket is the most different of any Scheme I know but it’s not hard to get started if you know one or the other. Racket (in my opinion) has more niceties around the development experience than Guile and a pretty dang good IDE if you ask me.
My employer, garden.io, offers pipelines you can run anywhere: in GitHub Actions, GitLab CI, locally, wherever! We capture all your dependencies in a dependency graph, then cache all your inputs: builds, tests, run scripts. We’re open source at https://github.com/garden-io/garden
Racket but I’ll take Guile Scheme as a close second. Then Hy, a lisp dialect of Python. I’m writing a blog written in a DSL of Racket right now, Pollen, that makes authoring a joyful experience. Hy gives me access to the entire Python ecosystem plus access to things like macros. Guile Scheme is the configuration language of the Linux distribution, Guix System. Guile’s G-Expressions are so powerful for writing packages.
Now that I’ve finished the first draft of an article on setting up rootless Podman on Guix System, I’m using and building out a set of tools to support a new article covering an all Red Hat stack from inner loop to CI.
So far, it’s