The best replacement for packer is vagrant.

The best alternatives to packer are rated as following:
★★★★★  vagrant
★★★★★  docker
★★★  yaourt
★★★  veewee
★  pacaur
★  poly prep
★  flat brisket
★  patchett
★  saint anns
★  jsmin
  murdoch
  bridge plug
  buc

Your alternative for packer is not listed? Suggest!
Speaking about packer, one probably shouldn't forget about stp.

Other search terms related to packer and their ratings are:
★★★★★ stp
★★★★★ liberace
★ miranda kerr
You have in mind a companion for packer and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of packer in all years. Click on graph for more.
packer
vagrant
docker