Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.
Steel Bank Common Lisp - Steel Bank Common Lisp (SBCL) is a high performance Common Lisp compiler.
GNU Aspell - GNU Aspell, usually called just Aspell, is a free software spell checker designed to replace Ispell.
CLISP - CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible.
Enchant - The easiest way to scale personalized customer support
Clozure Common Lisp - Clozure CL (often called CCL for short) is a free Common Lisp implementation with a long history.