LibreOffice

The most popular free open source office suite, it includes a word processor, spreadsheet, presentation software etc. It’s very widely used by businesses, governments, organisations and individuals, and is available for Linux, Mac and Windows.

Fediverse address:
@libreoffice@fosstodon.org

There are also user groups on the Fediverse:

Fediverse address (in Spanish):
@LibreOfficeEs@mastodon.social

Fediverse address (in French):
@LaMouetteODF@framapiaf.org

3D Printing Group

Fediverse group about 3d printing projects. If you follow the group and create a post that mentions the group account, the post will be shared with the rest of the group.

(Note that this group uses special software created by the group admin themselves, and works a bit differently to Guppe groups ⧉.)

Fediverse address:
@3dprinting@techhub.social

Tuta (formerly Tutanota)

Independent privacy-friendly email and calendar provider which is ad-free and paid for entirely by their users’ subscriptions. There are free open source apps for Android, iOS, Linux, Mac and Windows. There’s also support for E2EE and 2FA wherever possible.

Fediverse address:
@Tutanota@mastodon.social

Deutsche Zentrum für Luft- und Raumfahrt / German Aerospace Centre

German government centre for aerospace, energy and transportation research, and effectively the German space agency.

Fediverse address (main account, in German):
@DLR@social.bund.de

Fediverse address (alternate account, in German):
@dlr_next@social.bund.de

DataRequests.org / Datenanfragen.de

Non-profit organisation which is promoting people’s right to privacy, and making people more aware of their privacy rights.

Fediverse address (main account, in English):
@datarequestsorg@mastodon.social

Fediverse address (main account, in German):
@datenanfragende@mastodon.social

Fediverse address (technical account, in English):
@dev_at_datarequestsORG@chaos.social

Scarlet Ferret Bookshop

Online bookshop selling human-curated DRM-free ebooks by indie authors. Also sells digital magazines, non-fiction, bundles etc. All ebooks come with digital extra features such as additional stories, artwork, playlists etc.

Fediverse address:
@scarletferret@mastodon.online

Gancio

A free open source collaborative online calendar. It allows local communities to share a common calendar that anyone can post events to, even people without an account. (Posts are moderated to prevent spam though.) You can also interact with Gancio through the Fediverse, and it has RSS support for people who want to follow through feed readers.

Fediverse address:
@gancio@mastodon.cisti.org

EnoraVFX

Professional concept artist and illustrator (clients include Riot Games, 20th Century Fox, Magic: The Gathering). Fan of open source software such as Blender, Godot, Krita. Interested in Eco-punk themes, working with scientists tackling the climate crisis.

Fediverse address:
@Enora@mastodon.art

Topio e.V.

German non-profit organisation which helps ordinary people “de-Google” their phones by installing privacy-friendly operating systems. They run events to help with this including workshops, exhibitions, lectures etc.

Fediverse address (main account, in German):
@topio@mastodon.social

Fediverse address (photos, in German):
@topio@pixelfed.social

Fediverse address (events, in German):
@topio_space@mobilize.berlin

MPS Göttingen (Max Planck Institute for Solar System Research)

Research establishment in Göttingen, Germany which studies all the bodies that make up our solar system including the Sun, the planets, the asteroids etc. The Institute develops scientific instruments that are sent into space on ESA and NASA missions.

Fediverse address (English and German):
@mpsgoettingen@astrodon.social