awesome-common-lisp-learning

Common Lisp Implementations

Quickdocs - Documentation for projects in Quicklisp.
State of the Common Lisp Ecosystem, 2015 - Article about what libraries you should use, and why.
Articulate Common Lisp - Lists some useful libraries.
Articulate Common Lisp - Lists some useful libraries.

Lispbox - An IDE (Emacs + SLIME), Common Lisp implementation (Clozure Common Lisp) and library manager (Quicklisp), pre-packaged as archives for Windows, macOS and Linux. Descendant of "Lisp in a Box" mentioned in Practical Common Lisp.
Lispworks Personal Edition - A non-Emacs based IDE for LispWorks Lisp, with some restrictions.
Articulate Common Lisp - A HOWTO for putting together a Lisp environment, and has information on useful libraries and how to structure projects.
Emacs - lisp.net/project/slime/) and a supported Common Lisp implementation. See the SLIME manual for more details.
installing an implementation
Portacle - A portable and multiplatform Common Lisp environment. It ships a slightly customized Emacs with SLIME, SBCL (a popular Common Lisp implementation), Quicklisp and Git. No installation needed, so it's a very quick and easy way to get going.
Lispbox - An IDE (Emacs + SLIME), Common Lisp implementation (Clozure Common Lisp) and library manager (Quicklisp), pre-packaged as archives for Windows, macOS and Linux. Descendant of "Lisp in a Box" mentioned in Practical Common Lisp.
Articulate Common Lisp - A HOWTO for putting together a Lisp environment, and has information on useful libraries and how to structure projects.

ebook
errata page
ANSI Common Lisp by Paul Graham - Good as a reference, covers CLOS, and has several example program implementations.
Chapter 1
Common Lisp Recipes by Edmund Weitz - A great set of Common Lisp patterns.
Object-Oriented Programming in Common Lisp by Sonya E. Keene - An in-depth description of the CLOS, and shows how to use it with example applications.
The Art of the Metaobject Protocol by Gregor Kiczales, Jim des Rivieres, and Daniel G. Bobrow - Describes the CLOS Metaobject Protocol (MOP).
Chapters 5 and 6 (available online) - The specification of a metaobject protocol extension to CLOS, by Robert Strandh.
modern public domain CLOS MOP specification - Philippe Paradis (Hexstream).
Adam Tornhill on AMOP - Recommends reading Practical Common Lisp, then Object-Oriented Programming in Common Lisp, and then AMOP.
Chapter 1
errata page
Chapters 5 and 6 (available online) - The specification of a metaobject protocol extension to CLOS, by Robert Strandh.
Adam Tornhill on AMOP - Recommends reading Practical Common Lisp, then Object-Oriented Programming in Common Lisp, and then AMOP.
The Art of the Metaobject Protocol by Gregor Kiczales, Jim des Rivieres, and Daniel G. Bobrow - Describes the CLOS Metaobject Protocol (MOP).
Land of Lisp by Conrad Barski, MD - A fun introduction to Lisp that uses comics and has you writing games.

Common Lisp: A Gentle Introduction to Symbolic Computation by David S. Touretzky - a good introduction for people new to programming. Contains code for really useful utilities like DTRACE and SDRAW.
Common Lisp: An interactive approach by Stuart C. Shapiro - A textbook that teaches mainly through the use of exercises.
Practical Common Lisp by Peter Seibel - A great introduction for experienced programmers, and tries to highlight from the very beginning what makes CL different to other languages.
On Lisp by Paul Graham - A great book for intermediately experienced Lispers.
Let Over Lambda by Doug Hoyte - An advanced book on Lisp Macros.
Comments on Let Over Lambda - Several people recommend that you be comfortable with On Lisp before reading this book, and that the start is slow.
The chapter on closures - Has several non-trivial examples, and demonstrates the power of this feature.
Common Lisp: A Gentle Introduction to Symbolic Computation by David S. Touretzky - a good introduction for people new to programming. Contains code for really useful utilities like DTRACE and SDRAW.
Common Lisp Koans - Not exactly a book, but a set of koans to help you learn the language.
Paradigms of Artificial Intelligence Programming by Peter Norvig - Has many interesting applications of Lisp, but is no longer a good reference for AI.
On Lisp by Paul Graham - A great book for intermediately experienced Lispers.
Let Over Lambda by Doug Hoyte - An advanced book on Lisp Macros.

Exercism's Common Lisp track - An excellent way to learn the language through practice, have your code reviewed, and to discuss solutions with other people.
Cliki - The Common Lisp Wiki. A great resource for all things CL. Has a great Getting Started page and an extensive list of Lisp books.
other rooms
Lisp Subreddit - An active community, and has loads of useful links and reference documents in the sidebar.
Common Lisp Subreddit - The Subreddit for Common Lisp.
Lisp Discord server - Is a Discord for Lisp. Has a channel dedicated to Common Lisp and will happily answer questions.
Cliki - The Common Lisp Wiki. A great resource for all things CL. Has a great Getting Started page and an extensive list of Lisp books.

The Common Lisp Hyperspec (CLHS) - The language reference document for Common Lisp. Bookmark it now.
Chapter 7 - Covers the Common Lisp Object System (CLOS).
Common Lisp the Language (2nd Edition) by Guy L. Steele - A description of the Common Lisp language from just before it was standardized by ANSI. Don't use it as a reference.
Cliki on CLtL2 - Claims it has more useful descriptions of LOOP and FORMAT than the CLHS does.
Stack Overflow on CLtL2 - Some recommend using CLtL2 for insight and inspiration, but to use the CLHS when programming.
A list of differences between CLtL2 and the ANSI Common Lisp specification.
Chapter 28 - Covers the Common Lisp Object System.
The Common Lisp Cookbook - A list of useful Lisp recipes. Also contains a list of other online sources of CL information.
The ANSI Common Lisp Standard Draft - The last draft version of the ANSI INCITS 226-1994 (previously ANSI X3.226-1994) standard.