Altus from innoBright look like a very interesting denoiser!

[Phoenix]

Take a look at this: innoBright Altus
(And here are also some FAQ.)

Really great results in the examples they show.
Looks darned well and promising in my opinion.

[Zom-B]

There has been a ton of denosing Papers released in the recent years, finally someone does read them

For me the input variables for this program are quite.... much!
You need two renders with different seed, and a crapton of Render Passes:

The Altus require two sets of inputs labeled with b0 and b1 rendered with different
sample seeds respectively.
The required AOVs are as follows:
RGB: This is the beauty render
ALB: This is an albedo AOV, unshaded texture AOV
VIS: This is the visibility of the geometry to the lights, a suitable AOV for this would be a
shadow AOV
NOR: Forward Facing Normals with bump map preservation
POS: World Position
CAU: Caustics AOV

By having two renderings you actually have twice the rendertime... having this doubled rendertime for your actual render should help denoising too ^^

I would love to see some denoise functionality directly in Indigo!
Something that does use such AOVs directly works in 32bit as a PostPro filter.