All recommended Apps

App Stores

FIRST STEP: install https://f-droid.org
Aurora Droid (other frontend for f-droid)
Aurora Store (alternative for Play Store, anonymous login possible)

Top 10 Apps

Mail - K9
Chat - Telegram FOSS

Communication

Mail - K-9 Mail https://f-droid.org/en/packages/com.fsck.k9
Chat - Telegram FOSS https://f-droid.org/en/packages/org.telegram.messenger

Social Media

Facebook - SlimSocial https://f-droid.org/en/packages/it.rignanese.leo.slimfacebook
Twitter - Twidere https://f-droid.org/en/packages/org.mariotaku.twidere
Intagram - Barinsta https://f-droid.org/en/packages/me.austinhuang.instagrabber
YouTube - NewPipe https://f-droid.org/en/packages/org.schabi.newpipe

Office

Markdown Notes etc. - Markor https://f-droid.org/en/packages/net.gsantner.markor

Media

Security

KeePassXC - KeePassDX https://f-droid.org/en/packages/com.kunzisoft.keepass.libre
Adblock - Blokada 5 https://f-droid.org/en/packages/org.blokada.fem.fdroid