GNU CLISP

GNU CLISP is a free software implementation of the Lisp programming language, allowing users to write, run, and test Lisp code on various computers. Lisp is one of the oldest high-level programming languages, known for its flexibility and use in artificial intelligence and complex data processing. GNU CLISP provides an environment where developers can create software, experiment with algorithms, or learn programming in Lisp without needing to purchase commercial tools. It includes features like an interpreter (which executes code directly) and a compiler (which translates code into a form that runs faster).