As title said, I want an app that can tag files like macOS (right click to tag with color) and would preferably integrate with Caja. I don't care if i need to have my file manager replaced, but i still would want to have this color tag system.
Caja colorizes folders natively: right click > Folder color.
See also
Yeah but I want tags like where you tag files with a color and you can find later all files with this color in the finder
The closest equivalent in MATE/Caja are Emblems.
Either by right clicking the file or folder or switching the left pane to drag-and-drop onto a folder/file:
-or - 
Like in macOS, you can arrange folders/files by emblems like so:
There isn't any colour "dot" emblems, but you can create your own in Edit → Backgrounds & Emblems
thanks mate, will try once i get on my mate install
It's Ambiance-Flat-Colors, but it's not supported and doesn't work on anything newer then 16.04, which I'm still running.
Hey, it's not working, I added the emblems but they don't show in the right-click menu "File's Emblem" like i expected. Is this a normal behavior, and what can i do to change this?
I'm not sure what went wrong. 
To set an emblem, right click the file/folder, open Properties and use the Emblems tab to set one (or more).
If you've just added some custom ones in Backgrounds & Emblems, it should appear in the list after re-opening the file's properties. If not, you can always restart Caja by pressing ALT + F2 and typing:
caja -q
I just tested emblems on 18.04 and it's working as expected.
What I want to do is set them using the right click menu (File's Emblem tab) like in macOS. Will try tho.
I think I understand now, you mean having the ability to set an emblem from the context menu, similar to tags on macOS:
Unfortunately, I'm not aware of any Caja extension that adds emblems to the context menu, but it might be possible by writing an extension in Python. I don't really know how easy this would be.