User-controlled decryption operations

Emulates a smart card and lets you control the decryption operationsGPL-3.0-or-later

Kryptos

End-to-end encryption for any messenger, over any channelAGPL-3.0-only

37C3 Wifi Setup

Official NOC application for connecting to the 36C3 Wi-FiApache-2.0

Conversations

Encrypted, easy-to-use XMPP instant messenger for your mobile deviceGPL-3.0-only

Material Notes

Simple, local, material design notesAGPL-3.0-or-later

Cryptocam - encrypting camera app

Take encrypted photos and video to protect sensitive information.GPL-3.0-or-later

Socks5 Proxy

Socks5 client based on VPNMIT

ProtonVPN - Secure and Free VPN

Free Swiss VPN with advanced security and privacy features.GPL-3.0-only

Proton Pass: Password Manager

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

Photok

Private Photo Vault, Hide Photos & Videos.Apache-2.0

Ente Auth - 2FA Authenticator

Free, Cross Platform, Private, Open Source Two Factor Authenticator AppAGPL-3.0-only

DroidFS

Store & access your files securelyAGPL-3.0-only

InviZible Pro: Tor & Firewall, DNSCrypt & I2P

Combine the strengths of Tor, DNSCrypt and I2P for security and anonymityGPL-3.0-or-later

FairEmail

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

CryptoSafe

Offline AES-256-GCM text encryption with Argon2idMIT

SnapSafe

Snap pics of anything, safely.MIT

Rethink: DNS + Firewall + VPN

Firewall apps, use WireGuard VPN, monitor network, block malware, change DNS.Apache-2.0

Bitmask

Encrypted communication for mere mortals (superheroes welcome, too).GPL-3.0-only

Calyx VPN

Free VPN Service offered by The Calyx InstituteGPL-3.0-only

Carnet

Powerful note taking app with sync and online editorGPL-3.0-only