Well thanks a lot for you fast reply.
I think, I took the wrong approach. I use Ubuntu since dapper and the name Ubuntu Touch misleaded me in the way, that I thought, those well known desktop apps should be my first choice.
When I did not find them in Openstore, I did not look for alternatives but for the "original" in Libertine and Snap.

I am pretty sure, I will be happy with mostly Openstore Apps.

Thank you frytz