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

Kiwix

Free open source app that lets you view and search reference materials such as Wikipedia, Gutenberg, StackExchange etc without an internet connection. This can be very useful in remote areas, during temporary outages, or during times of turmoil. Kiwix is available for Linux, Mac, Windows, Android and iPhone/iPad. You can optionally also create a self-hosted Kiwix hotspot, so that anyone physically near your server can access your copy of Kiwix through a local connection.

Fediverse address:
@kiwix@mastodon.social

Open Source Gardens

Organisation connecting gardeners all around the world, encouraging the use of open source seeds and similar philosophies. Posts in English and German.

Fediverse address (main):
@opensourcegardens@chaos.social

Fediverse address (videos):
@opensourcegardens@tube.tchncs.de

Fediverse address (blog):
@handwritten@notes.opensourcegardens.info

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