Sufferer renames lots of files at a time (or rather,their
extensions).

Handy for making your JPEGs drawer more uniform, for example :

BEFORE :

    blahblah.jpeg
    beepboop.jpg
    boopbeep.jfif

AFTER : 

    blahblah.jpg
    beepboop.jpg
    boopbeep.jpg

Of course, you can use it for any type of file, and use
your own extensions...!

Read the docs for a couple of "quirks" though ;)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  861    1636  52.6% -lh5- a359 Nov  8  1998 Sufferer.info
[generic]                14607   14736  99.1% -lh5- 81d2 Nov  7  1998 Sufferer/Sufferer
[generic]                 1174    2251  52.2% -lh5- ebda Nov  7  1998 Sufferer/sufferer.asc
[generic]                 1134    1994  56.9% -lh5- b95c Nov  7  1998 Sufferer/sufferer.bb2
[generic]                  195    1230  15.9% -lh5- 25d0 Nov  7  1998 Sufferer/sufferer.bb2.xtra
[generic]                 1174    2345  50.1% -lh5- c790 Nov  7  1998 Sufferer/Sufferer.guide
[generic]                 1391    3250  42.8% -lh5- dbf9 Nov  7  1998 Sufferer/Sufferer.guide.info
[generic]                  341     498  68.5% -lh5- b341 Nov  7  1998 Sufferer/Sufferer.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         8 files   20877   27940  74.7%            Nov  8  1998