The best replacement for gtt is gct.

The best alternatives to gtt are rated as following:
★★★★★  gct
★★★★★  carlisle
★★★★★  gtr r34
★★★★  a1c
★★★  s15
★★★  hba1c
★★★  r32 gtr
★★  r33 gtr
★  r34 gtr
  r33 gtst
  herbert arnold
  3 hour gtt
  gtt

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

Other search terms related to gtt and their ratings are:
★★★★★ cognizant
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Google Trends

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gtt
gct
carlisle