Cyph: End-to-end encrypted, authenticated, and ephemeral chat with voice, video, and file transfers.
DAT: Nonprofit-backed data sharing protocol for applications of the future.
Detsign: Use passphrases to generate deterministic Ed25519 signing keys.
Discord: All-in-one voice and text chat for gamers that’s free, secure, and works on both your desktop and phone.
Dircifrar: A directory synchronization and encryption tool.
Dovecot: Dovecot is an open source IMAP and POP3 email server for Linux/Unix-like systems, written with security primarily in mind.
Duniter: Duniter is an open source Relative Money Theory distributed forged blockchain, and the clients (silkaj, duniterpy, cesium, ...) use libsodium.
emberclear: An open source, privacy-first, encrypted chat app using progressive web app technologies. Built with Ember using all of the latest experimental features.
ente: A simple, end-to-end encrypted backup solution for photos and videos.
EQEmu: An open source project committed to providing custom EverQuest servers.
Ghost-Notes: A user-friendly, password protected note taking application for iOS.
Habitat: Habitat, by Chef, is automation that travels with the app.
Hat-Backup: A backend-agnostic snapshotting backup system.
KadNode: A small P2P DNS resolution daemon based on a Distributed Hash Table.
Keystone Enclave: An open source secure enclave for RISC-V processors.
KeepassXC: KeePass Cross-Platform Community Edition. KeePassXC stores your passwords safely and auto-types them into your everyday websites and applications.
Lawncipher: An embedded, encrypted, multi-purpose document store.
libagentcrypt: Library for symmetric encryption using SSH Agent. It includes a command line utility able to encrypt/decrypt files and/or passwords securely with your SSH keys.
Lumimaja: PasswordSafe with Argon2 KDF, data encrypted with ChaCha20-Poly1305, and YubiKey support.
MLVPN: A multi-link VPN (ADSL/SDSL/xDSL/Network aggregator)
Magic Wormhole: Get things from one computer to another, safely.
MaidSafe: A new secure way to access a world of existing apps where the security of your data is put above all else.
Muon: A fast stateless VPN with obfuscation to escape traffic monitoring.
Nahoft: An offline encryption tool for mobile phones designed to let people communicate during Internet shutdowns in Iran.
NTPsec: A security-hardened implementation of Network Time Protocol Version 4.
NanoChat: A P2P, E2E encrypted and discoverable chat application on top of nanomsg library.
Network Next: A real-time CDN for game traffic. You control the network!
Open Reputation: An open source decentralized platform that maps identity and reputation onto the Internet of Things.
OpenBazaar: A free market for all. No fees, no restrictions.
OpenGKS: An RFID gate keeper solution that automatically tracks, records data and sends text messages (SMS) and email notifications to parents upon a student's entrance and exit in school.
OpenR: Facebook's internally designed and developed routing protocol/platform.
PAVE: The password manager. Easy password sharing for teams. No cloud.
PCP: Pretty Curved Privacy (pcp1) is a command line utility that can be used to encrypt files.
PowerDNS: PowerDNS has been designed to serve both the needs of small installations by being easy to set up as well as for serving very large query volumes on large numbers of domains. Additionally, PowerDNS offers very high domain resolution performance.
QtCrypt: Lightweight, portable application that encrypts files and directories using a symmetric-key algorithm.
RavenDB: A LINQ-enabled document database for .NET.
Rebel Backup: Encrypted backups of important files to Dropbox and Google Drive.
Remembear: A full-featured, multi-platform password manager by TunnelBear.
Vim: Vim is a greatly improved version of the good old UNIX editor Vi. Libsodium is used for reading and writing encrypted files.
VOLTTRON: VOLTTRON is an innovative distributed control and sensing software platform. Its source code has been released, making it possible for researchers and others to use this tool to build applications for more efficiently managing energy use among appliances and devices, including heating, ventilation and air conditioning (HVAC) systems, lighting, electric vehicles and others.
Wifibroadcast: Transmitter and receiver of UDP packets using raw Wi-Fi radio.
Wire: Modern, private communications. Crystal clear voice, video and group chats. No advertising. Your data, always encrypted.
Zcash: Zcash is a decentralized and open source cryptocurrency that aims to set a new standard for privacy through the use of groundbreaking cryptography.
OpenZiti: Ziti is an open-source SDK and platform for agentless, embedded zero trust networking (mTLS+E2EE everywhere).
SilentDragon + SilentDragonLite: GUI full node and lite wallets for the Hush cryptocoin, which is focused on secure communications.
Libraries using libsodium
Here are some libraries and frameworks using libsodium. Send a pull request to add yours to that list.
Asio Sodium Socket: A header-only C++14 library implementing custom transport encryption using libsodium and Asio's stackless coroutines.
Blobcrypt: Authenticated encryption for streams and arbitrary large files.
Cordova Minisodium: A minimal sodium plugin for Cordova - for iOS and Android.
@deliberative/crypto: Typescript/WebAssembly library for public key cryptography, secret boxes, Shamir secret sharing and random shuffling. Runs on Nodejs, ESM, CommonJS and the browser.
EdCert: A Rust crate to sign and verify content using Ed25519.
Etebase: An open source SDK and backend to build end-to-end encrypted applications.
Folly: An open-source C++ library developed and used at Facebook.
Halite: High-level cryptography interface for PHP.
Hyperledger Indy: Everything needed to build applications that interact with an Indy distributed identity ledger.
Innovault: A toolkit to store sensitive data from web forms in an encrypted database.
libopaque: An implementation of the OPAQUE protocol.
liboprf: A library providing OPRF and Threshold OPRF based on libsodium.