551convGUI is a GUI interface for 551conv ;))
I've included sourcecode in E.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1796    6781  26.5% -lh5- a365 Feb 24  2001 /551convGUI/551convGUI.e
[generic]                   38      38 100.0% -lh0- f14a Feb  8  2001 /551convGUI/551ConvGUI
[generic]                  157     241  65.1% -lh5- 4339 Feb 24  2001 /551convGUI/551convGUI.readme
[generic]                  160     232  69.0% -lh5- 5850 Feb  8  2001 /551convGUI/551ConvGUI.info
[generic]                17226   47856  36.0% -lh5- fe3f Feb  8  2001 /551convGUI/551gui
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         5 files   19377   55148  35.1%            Mar  1  2001