An LGPL web server you can embed in your Common Lisp application.

A project to package and easily distribute Lisp software. It is loosely modelled after the ideas behind CPAN, for Perl.

A library to embed Common Lisp and special template tags into normal text files. Can be used for dynamically generated HTML pages. [Open source, Lisp Lesser General Public Licence]

A library for Common Lisp which provides an interface to the GD Graphics Library for the dynamic creation of images. It is based on UFFI and should thus be portable to all CL implementations supported by UFFI. [Open source, BSD-style license]

Common Lisp generator for Glade.

A library for Common Lisp which modifies the reader so that you can have interpolation within strings similar to Perl or Unix Shell scripts. It also provides various ways to insert arbitrary characters into literal strings even if your editor/IDE doesn't support them. [Open source, BSD-style license]

A portable Perl-compatible regular expressions for Common Lisp. [Open source, BSD-style license]

A Lisp Markup Language, i.e. it provides convenient means to convert S-expressions intermingled with code into (X)HTML, XML, or whatever. [Open source, BSD-style license]

James Anderson's collection of Common Lisp modules for XML includes XQuery support.

An interactive, collaborative Wiki dedicated to Common Lisp.

Closure is a free web browser written completely in Common Lisp.

An interface between Common Lisp and X Window.

A music synthesis and signal processing package in the Music V family.

mod_lisp is an Apache plugin which lets apache send requests to a lisp process to generate dynamic content. Think of it as java server pages for lisp. cl-pdf is a library to create files in Portable Document Format from Common Lisp.

A user interface development environment for Common Lisp and X11 or Macintosh. It helps you create graphical, interactive user interfaces for your software.

GDL Application Development System, dynamic Knowledge Base Language and Development Environment; Generative Web Language (GWL), an integrated web-based user interface platform, for rapid development and deployment of dynamic webserver-based apps. ANSI Common Lisp based.

Interactive Network Editor and Graphical Database.

A portable library for Common Lisp which can be used to fill templates with arbitrary (string) values at runtime. It is loosely modeled after the Perl module HTML::Template and compatible with a subset of its syntax. [Open source, BSD-style license]

Artificial intelligence in Lisp.

A software package for developing CGI scripts with Common Lisp. It implements a very basic HTTP/CGI interface (sending headers, getting GET/POST and environment variables) and offers tools for easier HTML generation with special support for handling HTML forms. [Open source, LGPL]

An open source implementation of the Common Lisp Interface Manager, a portable and standardized library for constructing user interfaces.

PLOB implements orthogonal persistency for LISP and CLOS objects

A .NET layer for Common Lisp. It enables Common Lisp applications to interact with .NET libraries. [Open source, BSD-style license]

A toolkit for building dynamic websites with Common Lisp. It employs the popular Apache web server for the actual HTTP communication between the server and the browser and it uses Marc Battyani's mod_lisp for the communication between Apache and the Lisp image. [Open source, BSD-style license]

A small package which can be used to programmatically rewrite (X)HTML documents such that certain attributes values are replaced by others. [Open source, BSD-style license]