It seem hard to get a good alternativ to the highly aclaimed Fatso from UAD. However, I reckon PSP Mixpack might work if you combine MixSaturator 2 with Mixpressor 2.  The MixSaturator 2 has a Warmth knob + saturator, which in a way seem like what Fatso has. Don't really sure though what the "Tranny" on Fatso does... Whats your take in alternative solutions to Fatso?
 
 

Checkout the UBK-1 from KUSH.
http://www.thehouseofkush.com/#!plugins/cosa
 
 

read this as well...
https://www.gearslutz.com...ression-uad-fatso.html

Thanks Carl!

ubk-fatso for VST? Only RTAS? Can't find UBK Fatson on their site...?
 

I don't think there's a UBK Fatso plugin; Carl was referring to the Kush UBK-1 compressor plugin. 
 
And yes, its saturation flavor and compression action can sound a lot like the UAD Fatso plugin.
 
Cheers,
Eddie
 

That's correct, from Recording Magazine:
"The KuSh Audio UBK Edition FATSO
Parallel to the plug-in release, audio engineer Gregory Scott of KuSh Audio, otherwise known by his online handle “UBK”, decided, “Wouldn’t it be great if the FATSO could do these other things...?”, so he created the UBK edition FATSO with Dave Derr's blessing."

Aha, guys, thanks for the tip!
 
What about the PSP suggestion? Anything close?

Sknote Distro.

It's modeled on the Distressor and the Fatso. If you only want to use the fatso turn down the threshold on the Distressor. It sounds great and it's cheap.

Sknote Distro:) I have the Sknote Double Compressor, which I just love: Didn't know they released Distro. Will most likely get that one.
 
Carl + Eddie, thanks for the tip!
UBK-1 seem awesome as well. Don't have the $£€ for that one now, even though it seem fantastic... In the future it might happen...