Public Domain
Works placed in the Public Domain are those to which the copyright has been relinquished.

Approximately. No doubt it's actually more complex than that.

A pertinent FAQ says: "Software placed in the public domain has all the freedoms required by the DFSG, and is free software."

Public Domain Software

  • Alexandria - Alexandria is a collection of portable public domain utilities
  • anaphoric-variants - anaphoric-variants gives access to anaphoric variants of operators through one macro: anaphoric
  • bubble-operator-upwards - bubble-operator-upwards is a function that "bubbles an operator upwards" in a form, demultiplexing all alternative branches by way of cartesian product
  • cartesian-product-switch - cartesian-product-switch is a macro for choosing the appropriate form to execute according to the combined results of multiple tests
  • cesdi - cesdi provides a compute-effective-slot-definition-initargs generic function that allows for more ergonomic initialization of effective slot definition objects
  • cl-ftgl - cl-ftgl is a set of bindings to the FTGL OpenGL font rendering library
  • cl-glfw - Is a public domain set of CFFI bindings for the GLFW OpenGL helper library
  • cl-openbox - cl-openbox provides and interface to the box.net file storage service web API
  • cl-soil - Common Lisp wrapper around the SOIL library
  • cl-sqlite - cl-sqlite is a library for interacting with sqlite databases through SQL
  • cl-syntax-sugar - cl-syntax-sugar is a convenience library of reader macros and of helper functions to create new syntax extensions and to use them with ASDF and Slime without enabling them in the global readtable
  • CL-TELNETD - CL-TELNETD is a CL telnet networking server
  • cl-utilities - A library of semi-standard utilities
  • COMPOSE - This is one of the hypothetical Common Lisp Utilities
  • DBC - DBC is a library for doing Design by contract ala the Eiffel programming language in Common Lisp
  • Decimals - A decimal number parser and formatting package for Common Lisp
  • definitions-systems - definitions-systems provides a simple unified extensible way of processing named definitions
  • Enchant - An interface for Enchant spell-checker library
  • enhanced-boolean - enhanced-boolean provides a canonical way of converting generalized booleans to booleans
  • enhanced-eval-when - enhanced-eval-when provides an enhanced eval-when macro that supports (eval-when t ...) as a shorthand for (eval-when (:compile-toplevel :load-toplevel :execute) ...), addressing concerns about verbosity
  • enhanced-find-class - enhanced-find-class provides a canonical way of converting class designators to classes
  • enhanced-multiple-value-bind - enhanced-multiple-value-bind provides an enhanced multiple-value-bind macro that adds support for lambda list keywords by expanding to a multiple-value-call when necessary
  • f-underscore - F-underscore is a convenience library to make writing lambdas shorter without having to resort to special syntax like arc's square brackets
  • fakenil - fakenil provides a canonical stand-in for NIL for contexts where NIL means "no value"
  • first-time-value - first-time-value returns the result of evaluating a form in the current lexical and dynamic context the first time it's encountered, and the cached result of that computation on subsequent evaluations
  • incognito-keywords - incognito-keywords introduces a new kind of keyword that looks just like any non-keyword symbol and allows safe usage of convenient but clashy symbol names by multiple libraries without conflicts through sharing
  • Infix - The infix notation for arithmetic in Common Lisp
  • its-library - its provides convenient access to multiple values of an object in a concise, explicit and efficient way
  • Jean-Philippe Paradis - Hello, I'm Hexstream and I've been doing Common Lisp related work intensively for 10+ years
  • Levenshtein - The Levenshtein Distance algorithm finds the minimum number of operations needed to transform one string into the other, where an operation is an insertion, deletion, or substitution of a single character
  • macro-level - macro-level is an embarassingly trivial convenience macro that saves on indentation while being more concise and direct
  • macroexpand-dammit - macroexpand-dammit is a code walker by John Fremlin
  • map-bind - map-bind is a macro that allows visual grouping of variables with their corresponding values (not necessarily 1:1) in calls to mapping operators when using an inline LAMBDA
  • metering - The Metering System is a portable Common Lisp code profiling tool
  • Misc-Extensions - A convenience library containing a motley collection of macros and other extensions
  • multiple-value-variants - multiple-value-variants gives access to multiple-value variants of operators through one macro: multiple-value
  • parse-float - A function to parse floating-point values from a string in Common Lisp
  • parse-number-range - parse-number-range parses loop's convenient "for-as-arithmetic" syntax into 5 simple values
  • place-modifiers - place-modifiers essentially gives access to hundreds of modify-macros through one single macro: modify
  • place-utils - place-utils provides a few utilities relating to setfable places
  • PLisp - PLisp is an s-exp syntax for generating PostScript files
  • positional-lambda - positional-lambda is a concise, intuitive and flexible syntax (macro) for trivial lambdas that eschews explicit (and often contextually-redundant) naming of parameter variables in favor of positional references, with support for a used or ignored &rest parameter and automatic declaration of ignored parameters when logical "gaps" are left in the positional references
  • quid-pro-quo - A contract programming library for Common Lisp in the style of Eiffel’s Design by contract
  • rtorrent-controller - rtorrent-controller is an application to control rTorrent
  • Sheafhom - Sheafhom is a package by Mark McConnell for large sparse linear algebra computations over the integers and other exact number types
  • SHUT-IT-DOWN - Exit the Common Lisp implementation
  • Soundex - The Soundex algorithm indexes words by their sound when pronounced in English, for example to account for differences in spelling
  • SQLite Lisp interface - SQLite Lisp interface is an interface to the SQL database SQLite library
  • stassats-inotify - stassats-inotify is an interface to the Linux inotify facility for file change notifications
  • stassats-ogg - stassats-ogg is an Ogg Vorbis container (metadata) reader/writer library
  • stassats-storage - stassats-storage is a CLOS ObjectStore
  • stassats-subtitles - stassats-subtitles is a movie subtitle editing library
  • symbol-namespaces - symbol-namespaces defines a new kind of package that's named by a symbol rather than a string
  • Toadstool - Toadstool is a library for pattern matching
  • trivial-garbage - trivial-garbage provides a portable API to finalizers, weak hash-tables and weak pointers
  • trivial-jumptables - trivial-jumptables provides efficient O(1) jump tables on supported Common Lisp implementations and falls back to O(log(n)) on others
  • trivial-package-local-nicknames - This was done so there is a portability library for the PLN API not included in DEFPACKAGE
  • trivial-template - Trivial Template is a really really trivial public domain templating hack
  • with-output-to-stream - with-output-to-stream provides a simple way of directing output to a stream according to the concise and intuitive semantics of format's stream argument
  • with-shadowed-bindings - with-shadowed-bindings establishes a new lexical context within which specified bindings are explicitly shadowed, making it clear that they are not referenced within, thereby reducing cognitive load