FakeAOCPU and FakeAO GPU... I see a forum search (on my end) yields no results... because of the newer SSAO feature the older post-effect may be politically unfavorable here in Hashland, but here's what I know.
About 10+ years back, a user named Jenpy wrote a Post Effect that emulated AO really nicely and really fast- this was well before Hash included SSAO as a feature (Screen Space Ambient Occlusion.) Jenpy's was really nice at first because it worked really well and came in 4 flavors... FastAO-32bit-CPU...FastAO-64bit-CPU and FastAO-32bit-GPU...FastAO-64bit-GPU. SOMEWHERE here on the forum are some wonderful samples with-and-without from Nancy Gormezano and myself. What AO brings to an image is a very important and realistic shading effect- pushing small details to great extent. I love using FakeAO and A:M's hair feature- those 2 features play very nicely together.
The GPU version was incredible because you could really-really push the effect of AO to extremes- but it had a screen size limitation of 720 X 486 and could not extend beyond. Jenpy had promised an unlimited update but seems to have fallen away from our forum over the ensuing years. The CPU version works at any resolution, and tho it is not as deluxe as the GPU version- it still works very nice and provides some features SSAO does not, like the ability to produce the AO effect in a separate file pass. (SSAO has a feature called 'SSAO effect only' which I imagine will render only the AO... requiring you to do 2 renders- one AO and 1 regular...)
http://jenpy.noob.jp...ao/fakeao_e.htm I see that Jenpy now charges $25 (did I buy it in the past? I must have!)
Both A:M SSAO and Jenpy's FakeAO are very swift renders... adding a second at best per frame render time. I admit that A:M's traditional AO feature takes way too long to render- provides very little if any effect, and has too little controls.
I really have to mess with the settings on the A:M SSAO before I can even see it... and AO is a feature (for me) that once I see what it adds to an image- I want more-more-MORE! This is one of the reasons I enjoy exporting A:M models to Element3D within After Effects... their AO feature is real-time (as in FAST!) and you can push it and keyframe it to your hearts content.