Jami

Free open source end-to-end encrypted peer-to-peer calling and messaging app. It supports video calls, audio, messaging and has a Skype-style interface. It has apps for all major platforms including Android, iPhone/iPad, Linux, Mac and Windows.

Fediverse address:
@Jami@mstdn.io

Briar

Free open source end-to-end encrypted peer-to-peer messaging system for Android and Linux which can be used online through Tor, or locally through wifi or bluetooth. Because it has local support it can be used even if the internet is shut down or broken, for example at demonstrations or in disaster zones.

Fediverse address:
@briar@fosstodon.org

Manyverse

A new kind of social network which works peer-to-peer, and all personal data is stored locally on your computer or phone. It’s part of the Scuttlebutt network, but has a user-friendly interface, features and branding that are aimed at a more mainstream audience. There are free open source apps for iOS, Android, Linux, Mac and Windows.

Fediverse address:
@manyver_se@fosstodon.org