I have seen a tutorial for using Glaxnimate with Shotcut, but I don’t know how to do something similar with other free soft applications. Is it possible?
Not exactly the same, but you can use the other tools to create a PNG to use in Shotcut. I do not recommend trying to use the SVG from Inkscape—too many compatibility issues.
Is there any other standard format?
I mean the animate options in Krita, for example, similar to the ones on Glaxnimate? Which protocol/fotmat uses glaxnimate to communicate with Shotcut?
No, they are not similar or the same. Krita is raster; Glaxnimate is vector. In Krita you might be able to export animation as video with an alpha channel. You can do a web search on that topic to learn more. But you can export a PNG image sequence.
Which protocol/fotmat uses glaxnimate to communicate with Shotcut?
A custom one I added to Glaxnimate including a QImage in shared memory. You would need to read the source code; I do not volunteer to add it to Krita anytime in the near future.
Ok. Thank you for the info 
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