NVIDIA GameWorks Integration

Hello everybody,

I’d like to know what tool of Gameworks is “really integrated” in UE4 actually. If i visit page: :I see tools like Cataclysm - sort of abandonned project… What about Flex, flow or Blast ?
I see in thread many forks which port the official nvidia to 4.20 or 4.21…
I think VRWorks is integrated… but what % of …

For me, integrated is that we can use it without recompile a fork of UE4 Editor… such as un plugin.

**Could you please clarify ** ? What is the politic of Epic and Nvidia ?

Many Thanks,
Greg