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Modern versions of AutoCAD feature an "App Manager" or access to the Autodesk App Store. While many plugins here are compiled ARX/NET applications, there are also numerous LISP-based add-ons available.
Websites such as , JTB World , and DotSoft offer libraries of LISP routines.
Malicious LISP routines can delete files, corrupt drawings, or plant viruses.
for your industry (Architecture, Civil, Mechanical)
(defun C:TC ( / ss i ent elist str newstr) (setq ss (ssget '((0 . "TEXT,MTEXT")))) (if ss (repeat (setq i (sslength ss)) (setq ent (ssname ss (setq i (1- i))) elist (entget ent) str (cdr (assoc 1 elist)) newstr (if (eq str (strcase str t)) (strcase str) (strcase str t)) ) (entmod (subst (cons 1 newstr) (assoc 1 elist) elist)) ) ) (princ) )
Some older LISP routines may not work perfectly on AutoCAD LT (which only recently added LISP support) or the latest 2025 versions. If you'd like, I can help you: Write a custom LISP for a specific task you have Troubleshoot a routine that isn't loading
Are you spending too much time on repetitive tasks in AutoCAD—like counting blocks, drawing standard details, or batch-renaming layers? LISP routines ( .lsp files) are the secret weapon that can automate these chores instantly.