- access - Access is a library to ease getting and setting values in nested dictionary-like objects by providing a unified interface to hash-tables, clos-objects, plists and alists
- Alexandria - Alexandria is a collection of portable public domain utilities
- arnesi - arnesi is a collection of utilities written by Marco Baringer
- aromyxo - aromyxo is Lars Rune Nøstdal's utilities library
- bind - Bind combines let*, destructuring-bind and multiple-value-bind into a single form
- bknr-utils - bknr-utils is a collection of utilities for bknr
- bytecurry.mocks - bytecurry.mocks is a small library to help mocking functions and methods while writing unit tests
- ch-util - Cyrus Harmon's CL utilities
- cl-ana - cl-ana aims to provide the basic tools necessary to analyze large/medium-large datasets
- cl-configuration - CL-CONFIGURATION is a package that provides a macro (DEFCONFIGURATION) which can be used to set up various logical pathnames in an elegant way
- cl-jpl-util - cl-jpl-util utilities library required by jpl-queues
- cl-mop - Basic tools to make dealing with CLOS easier and portable
- cl-scripting - cl-scripting is a collection of scripting utilities written by Fare Rideau
- cl-utilities - A library of semi-standard utilities
- CLLIB - CLLIB is a varied collection of Common lisp tools and routines in CLOCC
- de.setf.utility - de setf utility is a collection of Common Lisp utilities functions and several purpose-specific libraries
- documentation-utils - This is a small library to help you with managing the docstrings for your library
- dso-util - A small set of utilities, functions and macros, by David Owen
- Ecclesia - Utilities for parsing Lisp code, e.g
- fare-quasiquote - fare-quasiquote is a portable quasiquote implementation that plays well with pattern-matching
- fare-utils - fare-utils is a collection of utilities from Fare Rideau
- Formlets - This package implements self-validating formlets for Hunchentoot (it assumes cl-who)
- fprog - FPROG is a small library for functional programming written by John Wiegley
- fukacl - Eitarow Fukamachi's experimental Lisp utilities
- hu.dwim.util - A collection of utilities used mostly by the libraries at dwim dot hu
- incf-cl - (INCF CL) is a collection of utilities
- JARW - Dr John AR Williams' utilities
- kmrcl - KMRCL is a collection of utilities used by a number of Kevin Rosenberg's CL packages
- literate-lisp - Provides some support for org files as Lisp source files, including ASDF interface
- mccme-helpers - Yet another set of utilities functions
- metatilities - Everyone needs their own set of utilities… These are Gary King's
- metatilities-base - Everyone needs their own set of utilities..
- method-combination-utilities - Various utilities to make use and creation of custom method combinations easier
- monkeylib-utilities - monkeylib-utilities are Peter Seibel's utilities
- mop-utils - MOP-utils is a small library of utilities for the MetaObject Protocol
- my-util - Tomoyuki Matsumoto's common lisp utilities
- NHooks - A hook facility somewhat like Emacs but with improvements
- parse-number - parse-number accepts an arbitrary string and attempts to parse the string into one of the standard Common Lisp number types, if possible, or else parse-number signals an error of type invalid-number
- pathname-utils - This is a collection of common tests and operations to help handling pathnames
- pergamum - pergamum is a collection of small utilities by Samium Gromoff
- rutils - REASONABLE-UTILITIES (RUTILS) is yet another general purpose utilities package for COMMON-LISP
- s-utils - Utilities by Sven Van Caekenberghe
- SCLF - SCLF is Walter C
- Serapeum - Serapeum is a utility library, which can be used as a supplement to Alexandria
- smart-buffer - An output buffer that can spill to disk
- string-case - A macro that generates specialised decision trees to dispatch on string equality
- uiop - UIOP, the Utilities for Implementation- and OS- Portability, is a portability layer and basic utility library that comes as part of ASDF 3
- umpa-lumpa - Umpa-Lumpa is a set of utilities used by armish and liards
- YTools - YTools is a set of utilities that enhance or replace many Lisp facilities, such as the awful 'loop' and the hideous 'format'
No, seriously, don't write your own. The above list is comical. Nobody needs another "utility library" dependency.