The best replacement for oes is oem.

The best alternatives to oes are rated as following:
★★★★★  oem
★★  icp ms
★  sles
★  icp aes
★  catlin gabel
★  catlin
  mel
  icp-ms
  icp-aes
  netware 6.5
  os

Your alternative for oes is not listed? Suggest!
Speaking about oes, one probably shouldn't forget about upside down star.

Other search terms related to oes and their ratings are:
★★★★★ upside down star
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oes
oem
icp ms