AutoLISP

AutoLISP is a dialect of LISP, used as a scripting language by many versions of AutoCAD.

Sample files

 * Samples are abundant on the web. Try searching for "free autolisp", etc.
 * CAD-Corner.com: Free LISP Routines
 * gr505.zip → LSP.EXE (self-extracting LHA) → *.lsp

Links

 * AutoLISP
 * Autodesk Knowledge Network: About Source Code Files (AutoLISP)
 * Autodesk Knowledge Network: About AutoLISP Documentation (AutoLISP)