Although it is well-understood for traditional C/Unix programs, fewer people agree on exactly what its implications are when used in a typical CL environment. At least, I don't. Debate welcome
For more details see its page on the GNU project web site
- Arduino Lisp - Arduino Lisp is a compiler from a subset of Common Lisp to the subset of C++ used by the Arduino C++ compiler
- BASIC - A Quick, Dirty and Ugly Basic programming language interpreter
- Blocky - Blocky is a visual dialect of Common Lisp paired with an Emacs-like user interface
- Brainfuck in Lisp - Brainfuck in Lisp contains a brainfuck programming language virtual machine and a brainfuck optimizing compiler, which translates to lisp and compiles lisp to native code, and a sketch for an implementation of a lisp on brainfuck
- c-amplify - c-amplify is an s-exp syntax for writing C code
- C-Mera - C-Mera is a very simple source-to-source compiler that utilizes Lisp's macro system for meta programming of C-like languages
- Cedilla - Cedilla is a document preparation application with very complete Unicode support
- cgn - cgn is an interface to the gnuplot plotting library
- cl-ansi-term - cl-ansi-term allows to print various primitives on ANSI-complaint terminals
- CL-DATA-FORMAT-VALIDATION - CL-DATA-FORMAT-VALIDATION is provides a consistent regular interface for data conversion and validation (in the form of strings usually) into internal data types and for formatting internal data back into external presentable strings, all according to a conversion or type specification
- CL-DOCUTILS - CL-DOCUTILS is a Common Lisp implementation of the Docutils document preparation system for processing plaintext into such as HTML and LaTeX
- cl-gsl - cl-gsl provides bindings to the GNU Scientific Library (GSL) of mathematics routines
- cl-lex - cl-lex is a set of Common Lisp macros for generating lexical analyzers automatically
- cl-notify - cl-notify is a set of bindings for the libnotify desktop notification library
- cl-read-macro-tokens - Modify lisp reader, so that it could dispatch not only on characters, but also on arbitrary symbols in CAR
- cl-sane - cl-sane is a set of bindings for the SANE (Scanner Access Now Easy) image scanner library
- cl-smoke - cl-smoke is a SMOKE-based wrapper for the Qt and KDE GUI frameworks
- CLLIB - CLLIB is a varied collection of Common lisp tools and routines in CLOCC
- cloak - cloak is an experimental implementation of the JVM for SBCL on Linux/x86
- clos-diff - clos-diff is a library to create and apply diffs of CLOS objects in a compact representation
- closer-weak - closer-weak provides CLisp-style weak objects support for CMUCL and SBCL
- CLPMR - CLPMR is the Common Lisp ProcMail Replacement
- CLTIO - CLTIO is a UFFI binding to the Unix termio library for raw serial/terminal I/O
- com.informatimago.common-lisp.interactive - informatimago interactive is a collection of Unix-like file browsing commands, and REPL-management tools
- COM.INFORMATIMAGO.SUSV3 - SUSV3 is an interface to the Single Unix Specification version 3 API
- Dandelion - Dandelion is a plugin for Eclipse that supports Lisp programming in the Eclipse platform
- Date-Calc - Date-Calc aims to be a port of the Perl Date::Calc time-handling library
- Datoura - The "Data Touring Machine" is a small, simple and powerful data analysis and plotting application, that generates postscript output
- DAYDREAMER - A goal-based agent that models daydreaming, emotions, planning, and serendipity
- decaf - Decaf is an Java debugger GUI written in Lisp using CLIM
- eclipse - Eclipse is an X11 window manager written entirely in Common Lisp
- esrap-liquid - ESRAP-LIQUID -- more lispy packrat parser generator for Common Lisp, than ESRAP
- Fract - Fract is a web-based fractal zoomer for the Mandelbrot Set
- Geiriadur - Geiriadur is an application for natural language dictionary creation, management and use
- GNU - GNU is a project to create a GPL-licensed UNIX that was started by Richard Stallman, the creator of EMACS
- GRT Raytracer - GRT Raytracer is a Common Lisp ray-tracing system
- Incudine - Incudine is a music/DSP programming environment for Common Lisp
- jarw-markup - jarw-markup is a library for document preparation from s-expressions to html or latex, together with automated registration and conversion of media and mathematics
- jarw-media - media is application for managing and caching the conversion of media
- Langband - Langband is a rewrite of the popular roguelike role-playing Game Angband
- LISP-BINARY - A library to easily read and write complex binary formats
- LispLab - The main purpose of Lisplab is to to integrate all kinds of mathematics capabilities into one framework
- LoGS - A programmable log analysis engine available under the terms of the GPL
- MARCH - MArch is a daemon program that saves email going through a mail server into a database
- Maxima - Maxima is a GPL'd Common Lisp mathematics application for computer based algebra (an implementation of MIT's Macsyma system)
- mcclim-desktop - A clim-desktop clone
- NLISP - NLISP is an environment for numerical computation and visualisation like IDL or Matlab
- OpenMusic - OpenMusic is a visual programming language based on Common Lisp and CLOS
- ParenScriptObjectSystem - The ParenScript Object System (PSOS) is a facility for object-oriented programming in ParenScript using the same style and techniques as the Common Lisp Object System
- parseq - A parser generator for common lisp, inspired by ESRAP
- physical-quantities - A library for processing physical quantities: values, units, (and uncertainty)
- PVS Specification and Verification System - The PVS Specification and Verification System is a verification system: that is, a specification language integrated with support tools and a theorem prover
- smta - smta is a simple SMTP email server
- smtp4cl - SMTP4CL is a SMTP client library to send messages to an MTA (Mail Transport Agent)
- SNePS - SNePS (Semantic Network Processing System) is an AI system for building, using and retrieving information from propositional semantic networks
- swank-client - Common Lisp implementation of a Slime / Swank client
- umlisp - umlisp is an CLOS object-oriented interface to the Unified Medical Language System
- unit-conversion - units is an extensive measuring unit (time/weight/distance/etc and many other physical units) conversion library
- unit-formula - unit-formula is a library for units conversions and defining formulas with automated unit consistency checking and conversions
- vgplot - vgplot is an interface to the gnuplot plotting library with the intention to resemble to some of the plot commands of octave or matlab
- Volemad - VOLEMAD is an application for quickly interacting with Mullvad’s WireGuard servers, written in Common Lisp
- wcp-termcap - wcp-termcap is a library to parse Unix termcap (terminal capability) files
- XCL - XCL is a Common lisp implementation featuring a kernel written in C++ and an optimizing compiler with backends for x86 and x86-64
- xindy - xindy is an index processor that can be used to generate book-like indexes for arbitrary document preparation systems