Security

Riseup VPN
Secure VPN powered by Bitmask

Bitmask
Encrypted communication for mere mortals(superheroes welcome, too).

Insular
Isolate your Big Brother apps

p≡p | Pretty Easy Privacy (pEp)
Read and write encrypted e-mails

i2pd
Full-featured C++ implementation of I2P client

TrackerControl
TrackerControl allows to monitor and control hidden data collection in apps.

Standard Notes
A simple and private notes app

Freenet mobile
Access Freenet from the palm of your hand

Briar
Secure Messaging, Anywhere

OUI Lookup and Database
Find a device's manufacturer by its MAC address and browse OUIs assignments

AdAway
A free and Open Source ad blocker for Android.

SnoopSnitch
Check mobile network security

WireGuard
Next generation secure VPN network tunnel

eduVPN
eduVPN connects securely and encrypted to your institution or Internet

KeePassDX
Secure and open source password manager compatible with KeePass files.

ClassyShark3xodus - Scan apps for warnings
Checks apk(s) for known trackers (provided by Exodus) +other warnings and specs.

AirGuard - AirTag protection
Protect yourself from Apple's Find My Tracking

Vigilante
Know when a third-party app uses your device camera/microphone

XPrivacyLua
Really simple to use privacy manager for Marshmallow (6.0) and later

FindMyDevice
Locate your smartphone via SMS when it gets lost

Password Generator
Password Generator is an app for generating secure passwords

MotionLock
Keeps your device locked

Hypatia
A real-time malware scanner

mOTP
One-time password generator

Pushie
Provides temporary, secure, password sharing

DroidFS
Store & access your files securely

sNotz
An open-source and completely offline application to manage simple notes

PCAPdroid
No-root network monitor and traffic dump tool for Android devices

Lavabit Encrypted Proxy
Client for Lavabit‘s Encrypted Proxy

SelfPrivacy
Self-hosted services without pain