It's a Lisp, in the Scheme subset. It's original design was primarily around Programming Language Theory education - formerly it was PLT Scheme. Much of it wa

It's a Lisp, in the Scheme subset. It's original design was primarily around Programming Language Theory education - formerly it was PLT Scheme. Much of it was designed for educational uses, but it's a really well-rounded system with plenty of packages, a decent package management system, better performance than most interpreted languages. It comes with an IDE easier to pick up for newbies than Emacs (the usual Lisp/Scheme environment), but also runs fine as a command line REPL and compiler. It's kind of an oddball. While the development focus is mostly educational, specifically Programming Language theory, it's also very usable in the real world. There's a few tutorials on writing your own domain specific language in it. You can specify a language other than the default Racket, so one compiler/interpreter environment actually supports many Lisps and DSLs. I'm a long time dev who recently picked up SICP to learn why everyone says learning Lisp/Scheme will make you a better programmer, and Racket is by far the most interesting environment I've worked in. I haven't even touched Python, which was my money-maker, in months.