Lonely Tylenol First Post Sep 5, 2004 #2 Unearthed Arcana's got some. Essentially the d20 Call of Cthulhu rules reprinted.
Krieg First Post Sep 5, 2004 #3 The following all have rules for insanity: CoC D20/Unearthed Arcana Grim Tales OGL Horror
Aitch Eye First Post Sep 5, 2004 #4 I haven't read it, but there's the Book of Broken Dreams PDF. http://www.rpgnow.com/product_info.php?products_id=157&
I haven't read it, but there's the Book of Broken Dreams PDF. http://www.rpgnow.com/product_info.php?products_id=157&
Cthulhu's Librarian First Post Sep 5, 2004 #5 As the others have said, CoC d20 or Grim Tales. Those are the ones I'd recommend.