Atkinson Automation: AutoLISP routines made to order, and some free downloads of routines and tutorials.
AutoCAD LISP 2000: Some practical and annotated AutoLISP programming examples and related links in English and Spanish.
AutoLisp.Net: AutoLISP routines and technical help, where other visitors will answer the questions you posted online.
Autolisper: A selection of free autolisp routines for download.
Better Than Nothing AutoLISP Programs: A collection of free AutoLISP routines, solving typical everyday problems.
Martin Nigg: A number of free AutoLISP routines and related tips and tricks.
The Autolisp and Autocad Page: Offers an autolisp course, autolisp tips and tricks, and routines for download.
The AutoLISP Drawer: Free example AutoLISP routines, plus some explanations and related links.
The LISP Generator: A commercial, interactive, and automatic program generator for AutoCAD's AutoLISP language.
Vladimir Nesterovsky's: A collection of tricky AutoLISP routines and related tools, as well as explanations of some advanced language features.