The best replacement for stl is boost.

The best alternatives to stl are rated as following:
★★★★★  boost
★★★  atl
★★  std
★★  sea
★★  obj
★★  cin
★★  ari
★★  songbird
★★  step
★  kc
★  nym
★  mfc
★  dxf
★  lad
★  pit
★  iges
  hou
  bos

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Google Trends

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