In the table, apps that are in brackets are only partially supported for that Fediverse software - operating system combination.
Note that these are not all the apps available for the Fediverse, further investigation is encouraged.

This article is under construction!
We're about to move each apps description to a separate page and only leave the table, linking to the articles of the apps.
Other languages:

Table

Android iOS Sailfish OS GNU/linux MacOS Windows
Mastodon & forks Tusky, Fedilab, Mastodon, AndStatus, Indigenous, Subway Tooter, dndkodon, Twidere X, Tokodon Mastodon, Metatext, iMast Tooter, Michabo Whalebird, TheDesk, Sengi, Hyper-space, Michabo, Tokodon Whalebird, TheDesk, Mastonaut, Hyper-space Whalebird, TheDesk, Sengi, Hyper-space
Pleroma Fedilab, Indigenous, (Subway Tooter), (Twidere X) (Amaroq) Whalebird, Sengi, (Hyper-space) Whalebird, (Hyper-space) Whalebird, Sengi, (Hyper-space)
Misskey MilkTea, Subway Tooter MissCat Whalebird, TheDesk Whalebird, TheDesk Whalebird, TheDesk
GNU Social Fedilab, AndStatus
Friendica Friendica, Fedilab, Relatica (Hyper-space) (Hyper-space) (Hyper-space)
diaspora* dandelior*, dandelion*
Hubzilla Nomad, Twidere, AndStatus
WriteFreely WriteFreely for iOS
Plume
Lemmy Jerboa, lemmur, Summit, Thunder Mlem, Remmel
Pixelfed Pixelfed, PixelDroid, Fedilab, (Tusky), (Twidere X) Pixelfed, Metatext (Whalebird), (Sengi) (Whalebird) (Whalebird), (Sengi)
PeerTube TubeLab, Fedilab, Thorium, NewPipe
Funkwhale Funkwhale for Android, Ultrasonic, SubStreamer SubStreamer
Mobilizon Mobilizon
BookWyrm

Subway Tooter

Subway Tooter is a Mastodon client for Android, supporting multiple accounts. Also this app has partially support for Misskey.

Repo for F-Droid: https://android.izzysoft.de/repo/apk/jp.juggler.subwaytooter

Google Play: https://play.google.com/store/apps/details?id=jp.juggler.subwaytooter

License: Apache License 2.0

Mastodon

Website: https://joinmastodon.org/apps

App Store: https://apps.apple.com/app/id1571998974

Google Store: https://play.google.com/store/apps/details?id=org.joinmastodon.android

License: GNU General Public License v3.0

Metatext

Website: https://metabolist.org/metatext

Metatext is a modern and accessible Mastodon client.

App Store: https://apps.apple.com/app/id1523996615

License: GNU General Public License v3.0

Tooter

Mastodon App for Sailfish OS.

Repo: https://openrepos.net/content/dysko/tooter

Lizenz: GNU General Public License v3.0

PixelDroid

Website: https://pixeldroid.org/

PixelDroid is an Android client for Pixelfed.

F-Droid: https://f-droid.org/en/packages/org.pixeldroid.app/

License: GNU General Public License v3.0

TubeLab

Website: https://fedilab.app/

Full featured Peertube Android app.

F-Droid: https://f-droid.org/packages/app.fedilab.tubelab/

Google Play: https://play.google.com/store/apps/details?id=app.fedilab.tubelab

License: GNU General Public License v3.0

Funkwhale for Android

Website: https://funkwhale.audio/en_US/apps/

This is the official Android music player for Funkwhale.

Repo for F-Droid: https://fdroid.funkwhale.audio/

License: MIT License

WriteFreely for iOS

Website: https://writefreely.org/apps/ios

Publish to your WriteFreely blog with the official WriteFreely app for iPhone and iPad.

App Store: https://apps.apple.com/app/id1531530896

License: GNU General Public License v3.0

Friendica

F-Droid: https://f-droid.org/en/packages/de.wikilab.android.friendica01/

A full interface for Friendica, including timeline display and the ability to view and post on you and your friends' profile walls.

License: Mozilla Public License 2.0

Mobilizon

A simple client to interact with Mobilizon instances.

F-Droid: https://f-droid.org/packages/app.fedilab.mobilizon/

Google Play: https://play.google.com/store/apps/details?id=app.fedilab.mobilizon

License: GNU General Public License v3.0

MilkTea

It is an application for using Misskey from Android.

Google Play: https://play.google.com/store/apps/details?id=jp.panta.misskeyandroidclient

License: GNU General Public License v3.0

MissCat

Website: https://yuiga.dev/misscat/

MissCat is an iOS client that makes handling Misskey easier and more comfortable.

App Store: https://apps.apple.com/app/id1505059993

License: Apache License 2.0

dandelion*

A client for diaspora*.

F-Droid: https://f-droid.org/packages/com.github.dfa.diaspora_android/

License: GNU General Public License v3.0

Nomad

Nomad is a client for Hubzilla.

F-Droid: https://f-droid.org/en/packages/com.dfa.hubzilla_android/

License: GNU General Public License v3.0

lemmur

(No longer maintained) lemmur aims to provide a seamless experience when browsing different Lemmy instances.
You can have multiple instances added at the same time without having to awkwardly switch between them.

F-Droid: https://f-droid.org/en/packages/com.krawieck.lemmur/

Google Play: https://play.google.com/store/apps/details?id=com.krawieck.lemmur

License: GNU General Public License v3.0

Remmel

App Store: https://apps.apple.com/app/id1547988171

License: MIT License

Twidere

Twidere is a Microblogging-Client

F-Droid: https://search.f-droid.org/?q=Twidere

License: GNU General Public License v3.0 or later

AndStatus

F-Droid: https://f-droid.org/de/packages/org.andstatus.app/

License: Apache License 2.0

Jerboa

A native Android app made by Lemmy's developers
F-Droid: https://f-droid.org/packages/com.jerboa
Google Play: https://play.google.com/store/apps/details?id=com.jerboa
IzzyOnDroid: https://apt.izzysoft.de/fdroid/index/apk/com.jerboa
GitHub: https://github.com/dessalines/jerboa/releases/latest
License: AGPL-3.0 license

Mlem

A Lemmy client for iOS
Apple Testflight: https://testflight.apple.com/join/xQfmkJhc
GitHub: https://github.com/buresdv/Mlem
License: Commons Clause