The best replacement for sumatra is foxit.

The best alternatives to sumatra are rated as following:
★★★★★  foxit
★★  maduro
★★  french roast
★★  verona
★  borneo
★  adobe reader
★  sulawesi
★  foxit reader
★  jawa
★  evince
★  flores
  foxit pdf
  sumatera

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Speaking about sumatra, one probably shouldn't forget about texniccenter.

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