General resources

• Common Lisp HyperSpec - The Common Lisp language specification.
• The Association of Lisp Users
• The comp.lang.lisp news group.
• CLOCC - The C ommon L isp O pen C ode C ollection.
• CLiki - A collection of links to and resources for free software implemented in Common Lisp and available on Unix-like systems.
• Successful Lisp: How to Understand and Use Common Lisp. By David B. Lamkins
• Lispweb - A mailing list for discussion of Lisp based web development.
• GNU libiconv - An iconv() implementation, for use on systems systems which don't have one, or whose implementation cannot convert from/to Unicode.

Common Lisp software

• CFFI - Common Foreign Function Interface
• UFFI - Lisp Universal Foreign Function Interface
• CL-SQL - A multi-platform SQL interface for Common Lisp
• CL-PPCRE - portable Perl-compatible regular expressions for Common Lisp
• CL-XML - Common Lisp support for the 'Extensible Markup Language'

• Maxima - symbolic mathematics program
• Imaxima - Emacs mode support for Maxima
• TeXmacs - can be used as an interface to the Scieneer CL and Maxima