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From Unreal Wiki, The Unreal Engine Documentation Site

Novodex is the default physics engine for UnrealEngine3

[edit] Content

[edit] Links

The Official Website

http://www.novodex.com/downloads.html

There is also Karma and Havok physics.

[edit] Discussion

OlympusMons: Didnt really know what to put here so I added the links to the novodex sites.

El Muerte: you know, there are much more physics engines than just the late Karma and Havok.

OlympusMons: Yeah I know I just figured those were more relevant to unreal engine development.