This video provides an overview of some well known commercial (not free) mixing and mastering plug-ins available for your DAW.https://www.youtube.com/watch?v=z6Cj_e8NUb8
i found the Golfoss Auto Eq plugin to be compelling.
I like the auto feature.
Honestly, a lot of $$$ are involved in this. Over $1500 for the list.
Most DAW's have at least some of the functionality provided by these plug ins.
Additionally many free plugins exist. Sometimes however, one gets what one pays for.
This video is Logic Pro X specific but I imagine these plugins work on most major DAW's.
If you use Logic Pro X this fellows videos (Music Tech Help guy) are comprehensive in the features and use of this DAW.
More stuff to spend your hard earned (or easily inherited) dollars on.