NVIDIA has created Cataclysm Liquid Solver for the Unreal Engine 4, which can process amazing looking fluid physics.
The Cataclysm Liquid Solver can simulate more than a million liquid particles in real time.
It uses a custom FLIP based GPU solver at its core. The custom solver is combined with Unreal Engine 4’s GPU Particles with Distance Field Collisions to allow artists to flood environments with physically simulated liquid.
As of now Cataclysm Liquid Solver only works with Unreal Engine 4 and can be downloaded right now on GitHub, though to download users need to have access UE developer account and a NVIDIA GameWorks Developer Account linked to their GitHub account.