This is one of my plugins for ArtEffect2/3+.

Autocrop is able to crop or mask the border of picture, what does come in handy
for scanned drawings.
It is also able to crop the picture to the current mask.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 7998   12536  63.8% -lh5- db75 Jul 18  1999 plugins2/Autocrop.pss
[generic]                 2959    7879  37.6% -lh5- 8575 Jul 25  1999 Autocrop.guide
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files   10957   20415  53.7%            Jul 27  1999