The best replacement for power rack is squat rack.

The best alternatives to power rack are rated as following:
★★★★★  squat rack
★★★★★  half rack
★★★★  smith machine
★★  squat stand
★  power cage
★  squat stands
★  leverage gym
★  home gym
  power tower
  multi press rack
  manual rack
  on a smith machine
  body solid
  powerline

Your alternative for power rack is not listed? Suggest!
Speaking about power rack, one probably shouldn't forget about smith machine.

Other search terms related to power rack and their ratings are:
★★★★★ smith machine
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Google Trends

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power rack
squat rack
half rack