The best replacement for cryengine is udk.

The best alternatives to cryengine are rated as following:
★★★★★  udk
★★★★  unity
★★★★  unreal
★★  source
★★  frostbite
★  snowdrop
★  unreal engine
★  ue4
★  unity 3d
★  unreal engine 3
★  unity 4
  chrome engine
  unreal engine 4
  unreal 4
  fox engine

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