Are there any purely functional Schemes or Lisps?

Question

I\'ve played around with a few functional programming languages and really enjoy the s-expr syntax used by Lisps (Scheme in particular).

I also see the advantages of

Answer 1

there is owl lisp, a dialect of scheme R5RS with all data structures made immutable and some additional pure data structures. It is not a large project, but seems to be actively developed and used by a small group of people (from what I can see on the website & git repository). There are also plans to include R7RS support and some sort of type inference. So while probably not ready for production use, this might be a fun thing to play with.