The best replacement for tst is ppd.

The best alternatives to tst are rated as following:
★★★★★  ppd
★★★★  tbs 13
★★★★  tbs
★★  ibp
★★  obp
★★  smarty
★★  bamt
★  denial
★  igra
★  tbs war
★  mongkok
★  opg
  qft
  bonafide

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

Other search terms related to tst and their ratings are:
★★★★★ smarty
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Google Trends

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tst
ppd
tbs 13