Some of the resources listed in CLiki have Licenses which are not free according to the DFSG. Typically these are packages which are freely downloadable but forbid or place onerous restrictions on commercial use or redistribution

Non-free resources with their own CLiki pages

• ACL - ACL refers to Allegro Common Lisp from Franz, Inc., a non-free Common Lisp implementation
• CLHS - The Common Lisp HyperSpec (CLHS) is a non-free hyperlinked version of the ANSI Common Lisp Standard
• clhs ASDF wrapper - This trivial CLHS ASDF wrapper makes it even easier to install a copy of the CLHS locally on your computer, using Quicklisp
• FMOD - FMOD is a non-free cross-platform sound library, and one of the most feature-complete
• LispWorks - LispWorks is a non-free Common Lisp implementation
• Zebu - Zebu is a LALR(1) parser generator similar to YACC, but for Common Lisp