A screen grab from one of the Sonar ad pages on cakewalk.com - the one I have a red box around ...
Cal someone tell me what is this compressor and where can I find it?
Full sized image: http://www.sightsea.com/renders/sonar_compressor.jpg

It's a softube effect. It has a prochannel variant. Not 100% but I think it's call the FETpressor

Is it free with Platinum and if so where do I find it?

No, it isn't part of platinum.

No, it isn't part of platinum.

Thanks!

Its the condensed version of Softube FET compressor.
https://www.softube.com/index.php?id=fc
 
It sounds amazing. I don't own the PC version but I used the VST version and its a great plug in.

Softube FET compressor - an emulation of the UA 1176.  It is part of their Mix bundle (I believe that is the right name) and goes on sale through Cake every so often (and Softube has sales too!).
 
I usually just use the Cake 1176, but I don't usually push these softwares but use them for vol shaping.  I have a hardware model for tone, so others may have a different view of the relative value of the two.
 
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Softube FET compressor - an emulation of the UA 1176.  It is part of their Mix bundle (I believe that is the right name) and goes on sale through Cake every so often (and Softube has sales too!).
 
I usually just use the Cake 1176, but I don't usually push these softwares but use them for vol shaping.  I have a hardware model for tone, so others may have a different view of the relative value of the two.

You are correct, they are similar. there is quite a difference between the controls (look ahead, low and high cuts as well as side chain built in to the GUI). But similar in what they do.