I know they don't have the 'production-ready' stamp, but if I were to jump back into the JVM world it would be Frege at this point. It is basically a Haskell on

I know they don't have the 'production-ready' stamp, but if I were to jump back into the JVM world it would be Frege at this point. It is basically a Haskell on the JVM. It compiles to Java source code, so you can work it in slowly to your real project [1]. You can call Java from Frege, or Frege functions from Java. ABCL - Armed Bear Common Lisp is another, but Lisp on the JVM instead of Haskell. It's been around for a while, and has become fast for a Lisp on the JVM, though it's not SBCL in speed. It does however support full 32 bit integers on 32 bits sytems compared with SBCL's 29 bits on 32 bit systems due to boxing. Again, not used much in production, although, there are some great testimonials of some cool implementations [2]. I particularly like the Keck telescope code written in Lisp in 1994, ported to ABCL and using Java for some image work and display. [1] https://github.com/frege/frege https://github.com/frege/frege [2] https://common-lisp.net/project/armedbear/testimonials.shtml https://common-lisp.net/project/armedbear/testimonials.shtml