Good Game Engine for Open World Game

[Deb_Gamer]

Please suggest me a good game engine for creating an open world game. It will be better if the engine is free.

 

[RCFProd]

Unreal Engine 4

 

[pentium4inside]

Unreal Engine 4 anyday!
But Cryengine 3 it is for you if you love challenges!

 

[Chugalug_]

Unreal Engine 4 if you're up for some intensive tweaking, Unity Engine for non-power users.

 

[cryoburner]

Unity Engine always seems to perform poorly whenever developers try to do anything open-world with it. Perhaps it's just due to the developer's inexperience, but it wouldn't be my first choice for an open-world project.