GNU Common Lisp is described as 'GCL is the official Common Lisp for the GNU project. Its design makes use of the system's C compiler to compile to native object code, providing for both good performance and facile portability' and is an app. There are more than 10 alternatives to GNU Common Lisp for a variety of platforms, including Mac, Windows, Linux, BSD and Self-Hosted solutions. The best alternative is Hy, which is both free and Open Source. Other great apps like GNU Common Lisp are Steel Bank Common Lisp, CMU Common Lisp, Armed Bear Common Lisp and CLISP.
GNU Common Lisp is mainly a Programming Language but alternatives to it may also be IDEs. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of GNU Common Lisp.
CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible. Interpreter, compiler, debugger, CLOS, MOP, FFI, Unicode, sockets, CLX. UI in English, German, French, Spanish, Dutch, Russian, and Danish.
newLISP is a LISP-like scripting language for doing things you typically do with scripting languages: programming for the internet, system administration, text processing, gluing other programs together, etc.
Allegro CL is the most powerful dynamic object-oriented development system available today, and is especially suited to enterprise-wide, complex application development. Complex applications with billions of objects are now made easy with Allegro CL 9.0.