These are the package management systems that I use. A new package management systems just does this
http://xkcd.com/927/ What we need is a cross-platform cross-applicaton meta package management system which comes as configuration management that evolves to a general purpose package manager without relying on any external package manager.
I'm not fanboy enough and would happily replace:
emerge, equo, apt-get, aptitude, ipkg, dpkg, zypp rpm, yum, tazpkg, pacman, homebrew
tar/gzip, slackpkg (Yeah, you, Slackware, we were friends and you helped me for long enough. You shouldn't do all my work anymore, you're old. Take a rest)
pip, cabal, bundler, gem, composer, pear, cpan, ctan, cran, maven, vundle – haven't you also a love hate relationship with these?