The best replacement for unreal engine is cryengine.

The best alternatives to unreal engine are rated as following:
★★★★★  cryengine
★★★★★  unity
★★★★  source
★★★★  udk
★★★  quake engine
★★★  frostbite
★★  source engine
★★  id tech
  unity 3d
  crysis engine
  cryengine 3
  crytek engine

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unreal engine
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