Armed Bear Common Lisp is described as '(ABCL) is a full implementation of the Common Lisp language featuring both an interpreter and a compiler, running in the JVM'. There are more than 10 alternatives to Armed Bear Common Lisp for Windows, Linux, Mac, BSD and Self-Hosted solutions. The best alternative is Hy, which is both free and Open Source. Other great apps like Armed Bear Common Lisp are Steel Bank Common Lisp (Free, Open Source), CMU Common Lisp (Free, Open Source), ManKai Common Lisp (Free, Open Source) and Clozure Common Lisp (Free, Open Source).
Hy is a wonderful dialect of Lisp that’s embedded in Python. Since Hy transforms its Lisp code into the Python Abstract Syntax Tree, you have the whole beautiful world of Python at your fingertips, in Lisp form!
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.
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.
femtolisp is a simple, elegant Scheme dialect. It is a lisp-1 with lexical scope. The core is 12 builtin special forms and 33 builtin functions. It is fast, ranking among the fastest non-native-compiled Scheme implementations.