K-9 Mail

Full-featured email clientApache-2.0

Guerrilla Mail

Quickly receive anonymous and temporary mails.EUPL-1.2

mail

is a secure and open source e-mail clientApache-2.0

You Have Mail

Email Notification without Google Play ServicesAGPL-3.0-only

Tuta Mail

Encrypted email & calendar service - easy to use, secure by design.GPL-3.0-or-later

Voice Mail Player

Play media files through phone's ear-pieceGPL-3.0-only

Infomaniak Mail

The secure messaging service for your emailsGPL-3.0-only

BlitzMail

Share content and notes via emailAGPL-3.0-or-later

SimpleEmail

Simple and minimalistic email appGPL-3.0-only

FairEmail

Fully featured email client. Neat, intuitive user interface. Privacy friendlyGPL-3.0-only

Inbox Pager

Read and write e-mailsGPL-3.0-only

Ltt.rs

Simple and maintainable Android e-mail clientApache-2.0

Delta Chat

Decentralized private messenger with chat-shared tools and games.GPL-3.0-or-later

Proton Pass: Password Manager

Password manager created by the scientists who met at CERN behind Proton Mail.GPL-3.0-or-later

Thunderbird: Free Your Inbox

Thunderbird is a 100% Open Source, privacy-focused email app.Apache-2.0

FFUpdater

Updater for privacy friendly browsersGPL-3.0-or-later

Dib2Qm

Messenger for secured chats and groups (end-to-end encrypted)GPL-3.0-or-later

Tuta Calendar

Quantum-safe encrypted planner to schedule & manage your events & sync calendarsGPL-3.0-or-later

Thunderbird Beta for Testers

Thunderbird is a 100% Open Source, privacy-focused email app.Apache-2.0

Dinomail

App to interact with DinoMail.GPL-3.0-or-later