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Common Lisp/External libraries
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Common Lisp libraries exist for many purposes. Here we will showcase a small sampling of mature, useful, and free packages available, showing some of the functionality they provide.
System Utilities
/ASDF/ — Another System Definition Facility
/clbuild/ — A script to update/install the latest versions of all the most important Common Lisp packages
Roswell - An implementation installer and script launcher
Language Extension
These libraries add new control structures to the Common Lisp language.
Serapeum - Another general-purpose utility library.
rutils - radical yet reasonable syntactic utilities for Common Lisp.
/Iterate/ — Easy and extensible iteration
/Extended Binding/ — Pattern matching, anaphoric control structures, and more
/Cells/ — A constraint based programming paradigm that operates in a way similar to spread sheets
/Screamer/ — Efficient, nondeterminism for Common Lisp
/FSet/ — Functional programming in Common Lisp
generic-cl - Generic function interface to standard Common Lisp functions (equality, comparison, arithmetic, objects, iterator, sequences,…).
cl21 An experimental project that brings more modern idioms into Common Lisp (unmaintained)
Data Structures
/CL-CONTAINERS/ — A library for abstracting data structures details
FSet - A functional, set-theoretic collections data structure library.
cl-data-structures - a portable collection of data structures and algorithms (mainly dicts and sequences, with some statistical functions).
cl-competitive - Common Lisp algorithms collection for competitive programming.
Database
cl-dbi - A database independant interface
postmodern - A library for interacting with PostgreSQL databases
Mito - An ORM, with migrations, relationships and DB schema versioning
Crane - An ORM, based on the CL Objects System, with migrations
Parsing and Text processing
/CL-PPCRE/ — regular expressions library
/CXML/ — An XML parsing library
/CL-HTML-Parse/ — Parsing HTML
/CL-YACC/ — A parser generator
/CL-Walker/ — A Common Lisp parser for Common Lisp
Serialization and Persistent data
/Serialization/ — serialization of Common Lisp data (via cl-serialization and cl-store)
/ELEPHANT/ — A persistent object system
/CL-Perec/ — A persistent object system
GUI
/Ltk/ — Common Lisp interface to Tk (portable GUI library)
/McCLIM/ — A Common Lisp GUI builder
IUP- CFFI bindings to the IUP Portable User Interface library. IUP is cross-platform (Windows, macOS, GNU/Linux, with new Android, iOs, Cocoa and Web Assembly drivers), has many widgets, has a small api and is actively developed.
Graphics
/Vecto/ — A library for drawing and rastering vector graphic images
/CL-OpenGL/ — A set of GL, GLU, and GLUT bindings
Audio
Open Music - a visual programming, computer-aided composition environment.
CLM - Common Lisp Music is a music synthesis and signal processing package in the Music V family. It provides much the same functionality as Stk, Csound, SuperCollider, PD, CMix, cmusic, and Arctic — a collection of functions that create and manipulate sounds, aimed primarily at composers (in CLM's case anyway).
Incudine - Music/DSP programming environment for Common Lisp. Useful to design software synthesizers or sound plugins from scratch. It is also a compositional tool that allows to produce high quality sounds controllable at the sample level, defining and redefining the digital signal processors and the musical structures on-the-fly.
Web and Network
Dexador — A full featured HTTP client (that aims at replacing /Drakma/)
/Portable Allegro Serve/ — A fairly light weight, multithreaded, HTTP server
/Hunchentoot/ — A Web application server written in Common Lisp
Caveman - A fully featured web framework
Plump - An html/xml parser, tolerant on malformed markup
lquery - A jquery-like DOM/HTML manipulation library
Djula - A port of Django templates
Parenscript - A translator from Common Lisp to Javascript
Wuwei - Examples on how to do Ajax in Lisp
Further reading
http://cliki.net — The Common Lisp Wiki. Contains links to almost all existing free software Common Lisp libraries, and a few proprietary ones as well.
http://common-lisp.net/ — Hosts a vast number of Common Lisp projects.
https://github.com/CodyReichert/awesome-cl - A community-based list of "awesome" Common Lisp libraries
http://eudoxia.me/article/common-lisp-sotu-2015 - An opinionated post on the state of the Common Lisp ecosystem, from 2015