This is a powerful and easy-to-use tcl/tk-based program 
which can de/en-code BinHex, uuencoded, xxencoded, Base64,
and yEnc formats.

Xdeview uses tcl/tk 8.3, but the port can be configured to
use other tcl/tk versions (see the port Makefile).

WWW: http://www.fpx.de/fp/Software/UUDeview/