The best replacement for crucible is salem witch trials.

The best alternatives to crucible are rated as following:
★★★★★  salem witch trials
★★★★  mccarthyism
★★★  scarlet letter
★★★  code collaborator
★★  red scare
★★  stash
★  reviewboard
★  gerrit
★  holocaust
★  phabricator
★  death of a salesman
★  mccarthy era
★  good night and good luck
★  salem
  mccarthy
  guilty by suspicion
  good night & good luck

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Speaking about crucible, one probably shouldn't forget about fisheye.

Other search terms related to crucible and their ratings are:
★★★★★ fisheye
★★★★ stash
★ kelly mccann
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crucible
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