Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network - GitHub - berty/berty: Berty is a secure peer-to-peer messaging app t...
Briar has received funding from Small Media, the Open Internet Tools Project, Access, the Open Technology Fund, the Prototype Fund, Internews, the NLnet Foundation, the Next Generation Internet programme and the ISC Project.
https://briarproject.org/ provides better protection of metadata and it’s already on f-droid - plus, a desktop client is coming up.
Importantly, Briar funding paints the project as trustworthy https://briarproject.org/about-us/ :