Email Popup

Display a popup for new mailApache-2.0

APG

Encrypt email and filesGPL-3.0-only

SimpleEmail

Simple and minimalistic email appGPL-3.0-only

QuickMSG

Send encrypted instant messages via emailGPL-3.0-only

You Have Mail

Email Notification without Google Play ServicesAGPL-3.0-only

FairEmail

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

SimpleLogin | Anti-spam

Protect your email inbox with a secure and open source solution by SimpleLoginApache-2.0

Lightning Address to Invoice

Allows paying to email-like Lightning addresses from unsupported walletsApache-2.0

BlitzMail

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

Inbox Pager

Read and write e-mailsGPL-3.0-only

addy.io (formerly AnonAddy)

Anonymous Email ForwardingMIT

Tuta Mail

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

K-9 Mail

Full-featured email clientApache-2.0

Proton Pass: Password Manager

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

Delta Chat

Chat over e-mail. Elegantly Retro, Decentralized and Open. Privacy by Design.GPL-3.0-or-later

mail

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

Ltt.rs

Simple and maintainable Android e-mail clientApache-2.0

Oversec

Privacy for All Apps! Encrypt and Disguise Messages in All Your Apps!GPL-3.0-or-later

Organic Maps: Hike, Bike, Drive Offline

Navigate with Privacy - Community-Driven & Open-SourceApache-2.0

FindMyPhone

Helps you find a mislaid phoneGPL-2.0-only