AutoLISP
From Just Solve the File Format Problem
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