To adjust settings that are on the OSD, but through a app for linux. Like ASUS’s display widget?
You haven’t given us much to go on, but you might want to look at these options:
Plasma widgets:
I’m not sure if they would fulfill your needs as they don’t allow contrast control.
There is also a software package that can be installed via the AUR (it was only added to the AUR 2 weeks ago) that does enable both brightness & contrast adjustment (using ddcutil):
As it runs on Qt it should work with Plasma. So you could install it and then add its launcher to your desktop, or pin the launcher to the task manager, so that it can be quickly launched without the need to open your application menu.
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I bought a INNOCN 32M2V recently, it is great. The OSD sucks, bad controls & horid menu color, vision issues, can’t see & I am wondering if I can run thier software on Linux. I need a way to adjust it from the OS?
Can’t you do it from within Plasma’s System Settings? 
If you hover the mouse over the question mark, it’ll tell you what it’s for.
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Then return it. 
What, their PC Tool? It doesn’t mention your model number. Either way, I don’t think I’ve ever needed software for a monitor my entire life on Windows, Mac or Linux. All the controls and settings are available via the monitor itself.
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Vision issues, I can’t see the OSD good enough. Any way to adjust it un Limux?
No, it’s built in to the monitor itself.
Well, I can’t see it, so that sucks.
Have you looked in System Settings as I told you in post #2?