Here are the names of some of the distributions that use APT:
Debian GNU/Linux (http://www.debian.org) - it was for
this distribution that APT was developed
Conectiva (http://www.conectiva.com.br) -
this was the first distribution to port APT for use with rpm
Mandrake (http://www.mandrake.com)
PLD (http://pld.org.pl)
Vine (http://www.vinelinux.org)
APT4RPM (http://apt4rpm.sf.net)
APT HOWTO
1.7.7 - March 2002kov@debian.org