For those that bought the cheap $19 Tracktion 3 years ago, the FinalMix plugin was a great mastering/metering plugin.

It was property of Mackie, so when Tracktion went dark several years ago after Mackie turned it into abandonware, I was worried I wouldn't be able to use it once Tracktion quit working.

About 3 years ago, Tracktion was bought back by the original developer, and I am now running version 6 and I successfully got FinalMix to work with it.

Tracktion now have a very similar looking plugin for sale called MasterMix.
https://www.tracktion.com/products/master-mix

They charge $60 for it and some change.

I always said FinalMix was worth the price of Tracktion by itself. I use it on individual tracks as well as a mix bus plugin.

I can't vouch for MasterMix as compared to FinalMix. FinalMix was coded by Acuma, which was a software house that wrote code for Mackie's digital mixers back in the day.