Well, Flint/Flame/Inferno are actually MIGHTY systems, and Combustion is merely a rather pale shadow of FFI's Action module.

FFI is a compositing app, right. But we're talking realtime here.

It's used for pretty high profile stuff. You can have your client standing behind you while you work, and you won't have to wait for anything.

Gorgeous hardware, mighty software!

Whatever you throw at it, FFI is sure to handle it:

-work in 3D space
-3d/2d paticles
-3d displacement
-bicubics
-HD
-Resolution independent
-...ah, stuff it!

Take a look here for more information (be sure to take the online tour).