Welcome! Users should read this for how to use this list, and homeserver operators should read this for how to join this list.
Inspired by SDF, 4d2.org provides anarchist-run services, with a focus on technical transparency, user privacy and security.
English Tech collective
Synapse 1.121.1 Up-to-date
Via In-house Element.
A furry-oriented homeserver, associated with the Mastodon instance of the same name.
English Furry
Synapse 1.121.1 Up-to-date
Please register on the Mastodon instance first, and then use SSO to access the in-house Element.
A general homeserver.
English
A general homeserver. Owner also hosts other FOSS services.
English
Synapse 1.121.1 Up-to-date
Via Form.
A general homeserver operated by yatrix.org.
Deutsch Bridges
Synapse 1.122.0 Up-to-date
Via In-house Element.
A general homeserver, associated with the Mastodon instance of the same name.
日本語
Synapse 1.121.1 Up-to-date
Via In-house Element.
A general homeserver with a focus on privacy. Note that the homeserver is intended for peer-to-peer messaging, and thus has a short message retention period as well as limitations on joining large rooms; see privacy policy.
English
A general homeserver operated by yatrix.org.
Deutsch Bridges
Synapse 1.122.0 Up-to-date
Via In-house Element.
A general homeserver associated with a public shared Linux system.
English Deutsch Longstanding
Synapse 1.122.0 Up-to-date
Via In-house Element.
A homeserver operated by yatrix.org.
Deutsch Bridges
Synapse 1.122.0 Up-to-date
Via In-house Element.
A regional homeserver operated by a tech collective in Freiburg im Breisgau, Germany.
Deutsch Tech collective Regional
https://wir.freiburg.social/angebote/matrix/
Synapse 1.121.1 Up-to-date
Via In-house Element.
A regional homeserver intended to promote cultural groups in Graz, Austria.
Deutsch Longstanding Regional
Synapse 1.121.1 Up-to-date
Via In-house Element.
A homeserver operated for a cultural collective in Austria.
Deutsch
Synapse 1.121.1 Up-to-date
Via In-house Element.
A homeserver dedicated to Free Software enthusiasts and supporters.
English Technology
Synapse 1.121.1 Up-to-date
Via In-house Element.
A general homeserver, associated with the hashi.icu Misskey instance.
中文 Using Cloudflare CDN
Synapse 1.122.0 Up-to-date
Via In-house Element.
A general Matrix homeserver operated alongside an XMPP server.
English Deutsch
https://jabber.hot-chilli.net/2022/04/26/hot-chilli-matrix-server/
Synapse 1.121.1 Up-to-date
Via In-house Element.
A general homeserver. Owner also hosts other FOSS services.
English
Synapse 1.122.0 Up-to-date
Via In-house Element.
A personal homeserver.
Deutsch Longstanding
Synapse 1.122.0 Up-to-date
Manually, via your preferred client.
A regional homeserver operated by a tech collective in Magdeburg, Germany.
Deutsch Tech collective Regional
Synapse 1.121.1 Up-to-date
Via SSO.
A Matrix server based in Odesa, Ukraine, providing secure and decentralized communication for users in Ukraine and beyond.
English Українська
Synapse 1.121.1 Up-to-date
Via In-house Element.
A homeserver operated by adminForge.de, who also hosts other FOSS services.
Deutsch Bridges
Synapse 1.122.0 Up-to-date
Via In-house Element.
A general homeserver.
English
Synapse 1.121.1 Up-to-date
Via In-house Element.
A homeserver operated by a German tech collective with an emphasis on free software.
English Deutsch Tech collective
Synapse 1.121.1 Up-to-date
Via SSO.
A homeserver dedicated to the TTRPG community.
Deutsch
Synapse 1.122.0 Up-to-date
Via In-house Element.
A homeserver operated by a tech collective that works to include free software in churches.
Deutsch
https://doc.librechurch.org/Wiki.jsp?page=Matrix#section-Matrix-DieMatrixInstanzSynod.im
Synapse 1.121.1 Up-to-date
Via In-house Element.
A homeserver for an online tech blog.
Deutsch Technology
Synapse 1.121.1 Up-to-date
Via SSO.
A general homeserver. Owner also hosts other FOSS services.
English Deutsch Longstanding Bridges
Synapse 1.122.0 Up-to-date
Via In-house Element.
A general homeserver operated by the maintainer of Conduwuit.
English
https://conduwuit.puppyirl.gay/#can-i-try-it-out
Conduwuit 0.5.0 (1f871c6) Up-to-date
Via In-house Element.
A general homeserver with a focus on privacy.
English
https://unredacted.org/services/matrix/
Synapse 1.122.0 Up-to-date
Via In-house Element.
A general homeserver operated by Studenten Net Twente, a student organization at University of Twente.
English Nederlands Longstanding Bridges
https://syscom.utwente.io/info/matrix/homeserver/
Synapse 1.121.1 Up-to-date
Via In-house Element.
A general homeserver operated by an American tech collective.
English Tech collective
Synapse 1.121.1 Up-to-date
Manually, via your preferred client.
A general homeserver.
English
Conduwuit 0.5.0 (29c715a) Up-to-date
Via In-house Element.
A general homeserver known as "Yet Another Matrix Homeserver".
Deutsch Bridges
Synapse 1.122.0 Up-to-date
Via In-house Element.
Specialising in real-time communications, Aria Network operates XMPP and Matrix services. The homeserver uses their own fork of Synapse.
English Longstanding Bridges
https://aria-net.org/SitePages/Portal/HomeServer.aspx
Archon 1.120.2 Outdated
Via In-house Element.
A general homeserver.
English
Synapse 1.121.0rc1 Outdated
Via In-house Element.
A homeserver dedicated to students everywhere. Operated by the Student Union of Stuttgart University.
Deutsch
https://wiki.stuvus.uni-stuttgart.de/display/ITKB/Matrix+Messenger
Synapse 1.120.2 Outdated
Via In-house Element.
An archaeology-oriented homeserver, associated with the Mastodon instance of the same name.
English
Synapse 1.110.0 Vulnerable
Via In-house Element.
A personal homeserver.
English
Synapse 1.119.0 Vulnerable
Via In-house Element.
A general homeserver operated by a French tech collective. Note the resource restrictions before registering.
Français Tech collective
Synapse 1.117.0 Vulnerable
Via In-house Element.
A general homeserver.
Français Longstanding
Synapse 1.118.0 Vulnerable
Manually, via your preferred client.
A general homeserver operated by a French tech collective.
Français Tech collective
https://exarius.org/docs/services/exatrix/
Synapse 1.118.0 Vulnerable
Manually, via your preferred client.
A regional homeserver operated by a tech collective in Glasgow, UK.
English Tech collective Regional
https://opensource.glasgow.social/matrix
Synapse 1.114.0 Vulnerable
Via In-house Element.
A personal homeserver.
English Longstanding
Synapse 1.116.0 Vulnerable
Via In-house Element.
A regional homeserver for New Zealand.
English Regional
Synapse 1.118.0 Vulnerable
Via In-house Element.
A general homeserver.
English Bridges
https://oblak.be/platform/chat/
Synapse 1.117.0 Vulnerable
Via SSO.
A general homeserver.
Deutsch
https://blog.unixweb.de/telegram-abgeschaltet-alternative-matrix/
Synapse 1.113.0 Vulnerable
Via In-house Element.
A general homeserver operated by a French tech collective.
Français Longstanding Bridges Tech collective
https://tedomum.net/service/matrix/
A general homeserver.
English
Synapse 1.121.1 Up-to-date
Via In-house Element.
A general homeserver.
Cryptocurrency
Synapse 1.113.0 Up-to-date
Via In-house Element.
A homeserver dedicated to the Monero cryptocurrency community. 18+.
English Cryptocurrency
https://forum.monero.space/t/welcome-to-monero-space-forum/5
Synapse 1.118.0 Up-to-date
Manually, via your preferred client.
A homeserver operated by NitroKey, a company that sells privacy-oriented tech products.
English Longstanding
Synapse 1.116.0 Up-to-date
Via In-house Element.
A general homeserver.
Deutsch English
Synapse 1.114.0 Up-to-date
Via In-house Element.
A furry-oriented homeserver.
English Furry
Synapse 1.116.0 Outdated
Via In-house Element.
A homeserver dedicated to a furry community.
English Furry
Synapse 1.120.2 Up-to-date
Via SSO.
A homeserver for environmental lawyers and professionals, as well as activists in related fields.
English
Synapse 1.117.0 Outdated
Via In-house Cinny.
A homeserver dedicated to German students. Operated by the Computer Science Student Council of TU Dortmund.
Deutsch Regional
Synapse 1.122.0 Up-to-date
Via SSO.
A general homeserver.
Deutsch English Bridges
Synapse 1.122.0 Up-to-date
Via application.
A general homeserver operated by a French tech collective.
Français Tech collective
Synapse 1.121.1 Up-to-date
Contact the operator for an account.
A general homeserver.
Norsk
Synapse 1.121.1 Up-to-date
A Norwegian phone number or IP address is required; alternatively contact administrator. See here.
A general homeserver.
English
Synapse 1.121.1 Up-to-date
Anyone can apply for an account, which requires administrator approval.
A homeserver belonging to the eponymous Matrix community, described as a chill and welcoming left-leaning community, a minority friendly space, a place of self-expression and empowerment.
English
Synapse 1.121.1 Up-to-date
Contact the administrator for an account.
Homeserver for Free Software Foundation Europe.
English Tech collective
https://fsfe.org/news/2022/news-20220202-01.html
Synapse 1.121.1 Up-to-date
A recurring donation is required.
A general homeserver dedicated to Finnish users.
Suomi Regional
Synapse 1.120.2 Outdated
Via SSO.
A personal homeserver.
Deutsch
A homeserver belonging to safe space for members of the trans, nonbinary and queer community.
English Using Cloudflare CDN
Synapse 1.119.0 Vulnerable
Contact the administrator for an account.
A general homeserver as part of a suite of decentralized platforms.
English
https://communick.com/services/matrix
Synapse 1.115.0 Vulnerable
A subscription is required.
In Danish; tech collective
Dansk Tech collective
Synapse 1.114.0 Vulnerable
A membership is required.
In French; tech collective
Français Tech collective
Synapse 1.104.0 Vulnerable
A membership is required.
In French; tech collective
Français Tech collective
Synapse 1.109.0 Vulnerable
A membership is required.
In French; tech collective
Français Tech collective
Synapse 1.111.0 Vulnerable
A membership is required.