Which game engine was introduced for Assassin's Creed III?

AnvilNext was introduced for Assassin's Creed III.

Assassin's Creed III used AnvilNext, an updated version of Ubisoft Montreal's Anvil engine technology. The engine supported the game's large outdoor environments, weather effects, crowds, wildlife, naval sequences, and new movement through the North American wilderness. This technical foundation helped the 2012 game present a broader world than earlier entries.

The engine is part of Ubisoft's internal Anvil technology family, which was previously associated with games such as Assassin's Creed and Assassin's Creed II. Later Assassin's Creed titles continued to use updated versions of the technology, although Ubisoft's naming and technical descriptions evolved over time. AnvilNext should not be confused with Unreal Engine, Snowdrop, or Frostbite, which are separate game-engine families used by other developers or franchises. The capitalization is commonly written as “AnvilNext.”