The best replacement for ets is ams.

The best alternatives to ets are rated as following:
★★★★★  ams
★★★★★  carbon tax
★★  concordia
★★  polytechnique
★★  med board
★★  pcs
★  mnesia
★  endoscopic thoracic sympathectomy
★  su tmic
★  college board
★  haulin
★  meb
★  kaplan gre
★  etg
★  cpe tmic
★  second hand smoke
★  process west tmic
  micro ets
  dict

Your alternative for ets is not listed? Suggest!
Speaking about ets, one probably shouldn't forget about permissive tdy.

Other search terms related to ets and their ratings are:
★★★★★ permissive tdy
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Google Trends

Scale is based on the average worldwide traffic of ets in all years. Click on graph for more.
ets
ams
carbon tax