https://ricochet.im/
https://tox.chat/
https://conversations.im/omemo/
https://github.com/maqp/tfc
https://katzenpost.mixnetworks.org/
https://github.com/privacylab/talek
https://github.com/SabaEskandarian/Express
https://cwtch.im/
https://github.com/SabaEskandarian/ObliDB

Wikipedia
https://en.wikipedia.org/wiki/Oblivious_RAM
https://en.wikipedia.org/wiki/Software_Guard_Extensions
https://en.wikipedia.org/wiki/Web_of_trust
https://en.wikipedia.org/wiki/Trust_on_first_use