Just dumping this in this thread, since it is somewhat on topic:
So based on some quick reading today, it seems that the only secure messengers that exist at the moment and are fairly established _without any ties to blockchain or crypto_ and have clients for a regular laptop are:
Conversations/XMPP, Element/Matrix, Jami, Delta chat and Tox.
Does anyone here have any experience with them? What are the pro/cons according to you?