Guardian Project

While smartphones have been heralded as the coming of the next generation of communication and collaboration, they are a step backwards when it comes to personal security, Anonymity and Privacy. The Guardian Project aims to create easy to use apps, open-source software libraries and operating system modifications, and customized mobile devices that can be used and deployed around the world, by any person looking to protect their communications and personal data from unjust intrusion and monitoring (WireTap). http://guardianproject.info/

In March 2016, Guardian Project announced a partnership with F-Droid and CopperheadOS with the goal of creating "a solution that can be verifiably trusted from the operating system, through the network and network services, all the way up to the app stores and apps themselves"

Chat Secure Instant Messaging, Ostel VoIP, TOR - https://guardianproject.info/apps/