Current recommended libraries
Cliki contributors (that's you!) believe that the libraries on this page are considered "good enough for government use", and serve as a starting point when looking for a library covering a given field.

Library management / installation / Handling Packages

  • Quicklisp - A popular way of obtaining lisp libraries
  • asdf - System definition, aka Makefiles(in some implementation like sbcl, this is already installed by default)

General purpose utility libraries and commonly used libraries

  • alexandria - Collection of portable general purpose utilities. Used by a large number of other projects.
  • iterate - iterate is a lispy and extensible replacement for the LOOP macro.
  • closer-mop - A popular compatibility library allowing portable access to the MOP across implementations.
  • Regular expressions: cl-ppcre - highly useful and fast regular expressions engine.
  • Pattern Matching: optima - ML-style optimized pattern matcher.
  • Collections:
    • lisp-interface-library is a collection of pure and stateful data structures in interface-passing style
    • FSet is a functional set-theoretic collections package
  • Mathematics:
    • GSLL is an interface to the GNU Scientific Library
    • Maxima is a computer algebra system

System and low level management

Project managements

Logging:

  • Log4CL is high performance extensible logging library for Common Lisp
Unit Testing:
  • FiveAM is a simple regression testing framework
  • Stefil is a test framework, and its philosophy is to stay as transparent as possible
  • CLUnit is unit testing framework designed to be easy to use
Here's a report of various testing frameworks. see Also: Test framework comparison

Graphics libraries

Graphical User Interface:

Graphical drawing library:

Web development

HTTP server and frameworks:
  • Hunchentoot web server
  • RESTAS web framework
  • Clack web application environment for Common Lisp inspired by Python's WSGI and Ruby's Rack
  • ningle lightweight web application framework
  • Sytes is a small Common Lisp library for building simple website
Utilities:

HTTP client:

  • Drakma - an HTTP/HTTPS client library with session managements and more.
SQL database connectivity: Internationalization (i18) and localization (l10n):
  • Character encoding/decoding: flexi-streams - focus on features
  • Character encoding/decoding: babel - focus on speed
  • Character categories, etc: cl-unicode
  • Localization (number formats, etc): cl-l10n
XML:
  • CXML namespace, validating, SAX, StAX, W3C DOM, XPath 1.0, XSLT 1.0
  • S-XML simple XML parser
  • XMLS simple XML parser