K-9 Mail is one of the most popular free open source e-mail apps for Android devices. You can follow their official account at:

➡️ @k9mail

Their website is at k9mail.app

It's available to download from @fdroidorg, Google Play and Amazon App Store.

(You can also download the app and source from the git at github.com/k9mail/k-9)

PixelDroid is a FOSS app for using PixelFed (the Fediverse's alternative to Instagram). You can follow PixelDroid at:

➡️ @PixelDroid

The official site is at pixeldroid.org

PixelDroid has just been released on F-Droid at f-droid.org/packages/org.pixel

You can find out more about PixelFed from its site at pixelfed.org

You can join a PixelFed instance at pixelfed.org/join

Better is a tracker-blocking and ad-blocking app for iPhone, iPad and Mac. You can follow at:

➡️ @better

The app's website is at better.fyi

The app is available via the App Store, purchasing supports its development.

(The app and its related services are FOSS, source is available via the website.)

Dino is a free open source XMPP/Jabber messaging app for Linux and BSD desktop computers. You can follow at:

➡️ @dino

The official site is at dino.im

Dino supports end-to-end encrypted messaging through OMEMO, and they are now testing encrypted video calls too.

Joplin is a free open source notes & to-do app that can be synced online. You can follow at:

➡️ @joplinapp

It's available for Android, iPhone, iPad, Linux, Mac and Windows, you can download it from the official site at joplinapp.org

It can be synced with @nextcloud, Dropbox, WebDAV and OneDrive.

Carnet is a free open source alternative to Google Keep. It's a note-taking app that can be synced online. You can follow at:

➡️ @Carnet

As well as rich text notes, you can also store images, sound files and to-do lists.

It's available for Android (through @fdroidorg and Google Play) and for @nextcloud

You can find out more at getcarnet.app

Manyverse is a social network without servers. Friends communicate peer-to-peer, personal data is stored locally. You can follow at:

➡️ @manyver_se

The official site is at manyver.se

It's part of the Scuttlebutt network, but has a user-friendly interface & branding that is aimed at a general audience.

Manyverse is on Android and iOS, desktop users can use Scuttlebutt's apps.

Wallabag is a FOSS privacy-friendly alternative to Pocket, it lets you save articles for reading later. You can follow at:

➡️ @wallabag

The official website is at wallabag.org

There are apps for smartphones (iOS, Android), web browsers (Firefox, Chrome, Opera) and eReaders (Kobo, Kindle, PocketBook).

You can self-host the article storage system free, or use the paid flagship instance at wallabag.it

Metatext is a new Mastodon app for iPhone and iPad. You can follow the developers Metabolist at:

➡️ @metabolist

Metatext is FOSS and has just been released on the App Store:

apps.apple.com/app/metatext/id

You can find out more from the official developers' site at metabolist.org

F-Droid is a free open source app store for Android devices which only includes privacy-friendly FOSS apps. You can follow at:

➡️ @fdroidorg

The F-Droid app store can be installed from the official site at f-droid.org

Google Play has been removing Fediverse apps recently, seemingly without explanation. It is really important that we have independent and accountable alternatives like F-Droid.

Tigase is a private company which develops free open software for instant messaging through XMPP/Jabber. You can follow them at:

➡️ @tigase

They have a number of XMPP projects including server software and apps for MacOS (Beagle), iOS (Siskin) and Android (Stork).

Their website is at tigase.net

Monal IM is a FOSS XMPP/Jabber messenger app for iPhone, iPad and Mac, you can follow it here:

➡️ @Monal

You can find out more from the official site at monal.im

Monal is available from the Apple App Store and it supports OMEMO end-to-end encryption.

Kaidan is an XMPP/Jabber app for Linux and Android, and part of the @kde project. You can follow at:

➡️ @kaidan

You can download or find out more from the website at kaidan.im

Gajim is a free open source XMPP / Jabber app for Linux, Mac and Windows. You can follow at:

➡️ @gajim

You can download it from the official site at gajim.org

The FOSS Mastodon/Friendica/PixelFed/Pleroma app Fedilab and the FOSS PeerTube app TubeLab now have a new combined official account. You can follow them both at:

➡️ @apps

(This also includes news about other apps by the same author such as UntrackMe and OpenMultiMaps.)

Their official website is at fedilab.app

The apps are available from @fdroidorg and Google Play

Sengi is a free open source Mastodon desktop app for Linux, Mac and Windows, and there's also a browser version. You can follow at:

➡️ @sengi_app

There's also the developer's blog at:

➡️ @nicolas-constant

You can find out more and download Sengi from its official website at nicolasconstant.github.io/seng

Mastonaut is a Mastodon app for Apple Macs, you can follow its official account at:

➡️ @mastonaut

The official website is at mastonaut.app

The Briar Project is an encrypted FOSS peer-to-peer messenger app which can be used online through @torproject or offline locally through wifi or bluetooth. The "not yet official" Fediverse account for Briar is at:

➡️ @briar

Its offline mode means it can be used locally even if the internet is shut down (for example due to disasters or other reasons).

Briar's website is at briarproject.org

Hyperspace is a free open source Mastodon desktop app for Linux, Mac and Windows. You can follow at:

➡️ @hyperspacedev

The developers are also working on a mobile version called Starlight.

You can get the client or find out more from the Hyperspace website at hyperspace.marquiskurt.net

Kiwix is a free open source app that lets you view and search Wikipedia, other wikis and reference sites like StackExchange entirely offline. You can follow at:

➡️ @kiwix

The app is available for Android, iPhone, Linux, Mac and Windows from the official site at kiwix.org

It's also available via

It's really useful if you are temporarily or permanently without a reliable internet connection.

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