The best replacement for hsm is usm.

The best alternatives to hsm are rated as following:
★★★★★  usm
★★★★★  camp rock
★★★  grease
★★  elm
★  edm
★  sigma 10-20mm f4-5.6 ex dc hsm
★  tpm
★  tamron 28 75
★  ilm
  spectacular
  sdm
  canon usm

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

Other search terms related to hsm and their ratings are:
★★★★★ pki
You have in mind a companion for hsm and it is not yet here? Propose!



Google Trends

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hsm
usm
camp rock