SmartPurger can clean up AutoCAD drawings in a very controlled way. Even if you have drawings that causes AutoCAD to crash, SmartPurger will proceed with the batch processing. Great if you want to batch process even if you have thousands of drawings.
You’re not limited to only purge with SmartPurger. You can change the version of the drawing in the process as well as run any custom LISP or script that you have on each of the drawings.