mcrypt, and the accompanying libmcrypt, are intended to be replacements for the old Unix crypt, except that they are under the GPL and support an ever-wider range of algorithms and modes.

The latest file releases

Package	Release	Date	Notes / Monitor	Downloads
Libmcrypt	2.5.8	February 19, 2007		Download
MCrypt	2.6.8	November 22, 2008		Download