ricochet[1] is my preferred option for situations that would require something like tor messenger (which is very few situations, but I digress). I like that the UX has a built-in threat model (e.g. "do you really want to click on this?")
TAILS users can't use it because tor-over-tor is weird (ricochet uses its own tor process). but it looks like it's getting close.[2]
I wish the page had screenshots. That's usually a good measure of how the software is maintained. Currently the page mentions that it's "experimental".
As far as I can see currently the only widely used, secure protocols are Matrix and XMPP with OMEMO.
The Github page has one: https://github.com/ricochet-im/ricochet/
> As far as I can see currently the only widely used, secure protocols are Matrix and XMPP with OMEMO.
secure != metadata free