The best replacement for jack is plug.

The best alternatives to jack are rated as following:
★★★★★  plug
★★★★  miranda
★★★★  tiger
★★★★  aku
★★★  john
★★★  jill
★★  mad jack
★★  vonage
★★  chuck
★★  heath
★  jose
★  pulseaudio
★  ooma
★  magic jack plus
★  finn
★  tali
★  alsa
★  sawyer
★  heath joker
★  demongo
★  basic talk
★  ralph
★  triple h
★  skype
★  oogie boogie
★  locke
★  port
★  jeremy
  vic grimes
  jenny
  ledger
  knave
  nettalk
  viking
  balls mahoney
  jim
  barbossa
  davy jones
  line out
  terry funk
  floor jack
  booker
  terraria
  antonin
  crown
  geoff
  john kennedy
  mass transit
  net talk
  randy orton
  forklift
  boogie

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

Other search terms related to jack and their ratings are:
★★★★★ jack stands
★★★★ jill
★★★ pulseaudio
★★★ internet
★★ honey drinks
★★ fax
★★ caller id
★★ usb
★★ jack
★ fax machine
★ yak
★ phone
★ dsl
peter o'sullivan
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Google Trends

Scale is based on the average worldwide traffic of jack in all years. Click on graph for more.
jack
plug
miranda