Showing 202 open source projects for "secure email cient"

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  • 1
    Mox

    Mox

    modern full-featured open source secure mail server

    Mox is a modern email server written in Go that aims to be simple, secure, and standards-compliant. It includes SMTP, IMAP, DMARC, SPF, DKIM, and other protocols required to host email services. Designed for self-hosters and developers who want better control over their email stack, Mox focuses on code clarity, privacy, and correctness, offering a complete mail server solution that is easy to set up and maintain.
    Downloads: 0 This Week
    Last Update:
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  • 2
    Tutanota

    Tutanota

    Open source email service with a strong focus on security and privacy

    Tutanota is an open source email client focused on security and privacy. It is built with end-to-end encryption and 2FA, so you can be assured of utmost email security. Tutanota is always encrypted, so whether you’re using their secure webmail client, mobile apps or desktop clients, you can be sure to communicate securely.
    Downloads: 11 This Week
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  • 3
    OpenSign

    OpenSign

    The free & Open Source DocuSign alternative

    Welcome to OpenSign, the premier open source docusign alternative - document e-signing solution designed to provide a secure, reliable and free alternative to commercial esign platforms like DocuSign, PandaDoc, SignNow, Adobe Sign, Smartwaiver, SignRequest, HelloSign & Zoho sign. Our mission is to democratize the document signing process, making it accessible and straightforward for everyone.
    Downloads: 6 This Week
    Last Update:
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  • 4
    Proton Mail for Android

    Proton Mail for Android

    Proton Mail Android app

    ...It supports composing messages, viewing attachments, handling contacts, and configuring account and mail settings from within the app, giving users portable access to their secure inbox wherever they go. Because ProtonMail’s service never sees unencrypted content, the Android client performs necessary encryption and decryption on the device, aligning with Proton’s privacy-first philosophy and open-source security model.
    Downloads: 4 This Week
    Last Update:
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  • 5
    OpenArchiver

    OpenArchiver

    An open-source platform for legally compliant email archiving

    ...The platform combines a modern web UI with powerful backend services, including fast indexing, deduplication, encryption at rest, and asynchronous ingestion workflows, making it suitable for both small teams and enterprise deployments. Beyond simply capturing email, it emphasizes security and auditability with features like secure storage formats, file integrity verification, and detailed audit trails of user interactions.
    Downloads: 5 This Week
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  • 6
    Thunderbird for Android

    Thunderbird for Android

    Open Source Email App for Android (fka K-9 Mail)

    Thunderbird Android is the mobile counterpart of the popular Thunderbird email client, reimagined for Android phones and tablets so users can access, send, and organize email from multiple accounts with advanced features found in desktop clients. It embraces modern mobile UI design while supporting robust email protocols (IMAP/POP3) and standards like OAuth for secure logins to services such as Gmail, Outlook, or custom mail providers.
    Downloads: 6 This Week
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  • 7
    Proton Mail for iOS

    Proton Mail for iOS

    Secure email that protects your privacy

    Proton Mail for iOS is the official iPhone and iPad client that brings Proton’s secure, end-to-end encrypted email service to Apple’s mobile ecosystem, combining strong privacy protections with native performance and gestures. The app allows users to sign in to one or multiple Proton Mail accounts, read and compose encrypted messages, schedule emails, protect emails with passwords, set expiration timers, and organize mail with labels and folders inside a smooth, intuitive iOS interface. ...
    Downloads: 0 This Week
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  • 8
    Gpg4win

    Gpg4win

    GnuPG for Windows

    Gpg4win is the official Windows distribution of the GnuPG encryption ecosystem, providing an accessible graphical environment for secure email and file protection. It packages the GnuPG engine together with user-friendly tools such as certificate management utilities, Windows Explorer integration, and Outlook plugins, enabling encryption workflows without requiring command-line expertise. The suite supports both OpenPGP and S/MIME standards, allowing organizations and individuals to secure communications using widely recognized cryptographic methods. ...
    Downloads: 18 This Week
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  • 9
    Proton Mail Bridge

    Proton Mail Bridge

    Proton Mail Bridge application

    ...The Bridge app continues running even when its GUI is closed so that mail clients can remain connected and synchronized, and it supports automatic startup and robust credential handling via secure storage.
    Downloads: 16 This Week
    Last Update:
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  • 10
    GnuPG

    GnuPG

    Complete and free implementation of the OpenPGP standard

    GnuPG (GNU Privacy Guard) is a widely used free software encryption system that implements the OpenPGP standard to provide secure communication and data protection across multiple platforms. It uses a hybrid cryptographic approach combining symmetric encryption for performance with public-key cryptography for secure key exchange and identity verification. The software allows users to encrypt files and messages, create digital signatures, and manage cryptographic keys, making it a foundational tool for privacy-focused workflows. ...
    Downloads: 9 This Week
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  • 11
    magiclinksdev

    magiclinksdev

    Transactional email magic link and One-Time Password (OTP)

    The magiclinksdev project is an authentication service for magic link and One-Time Password (OTP) use cases. There is built-in email support through Amazon SES and SendGrid.
    Downloads: 0 This Week
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  • 12
    Session Desktop

    Session Desktop

    A Decentralized, Onion Routed, Private Messenger

    Session Desktop is an open-source, privacy-focused messaging application that brings secure, decentralized communication to desktop environments such as Windows, macOS, and Linux, providing users with encrypted text, media, and group chats without requiring phone numbers or email addresses. Built on the Session protocol and the Loki network, it routes messages through a distributed onion-routing network that hides metadata like sender, timing, and location so that conversations are resistant to surveillance and correlation attacks. ...
    Downloads: 9 This Week
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  • 13
    i2pd

    i2pd

    I2P: End-to-End encrypted and anonymous Internet

    i2pd (I2P Daemon) is a lightweight, full-featured C++ implementation of the I2P (Invisible Internet Project) protocol, designed for enabling anonymous, encrypted, and censorship-resistant communication. It functions as a router node in the I2P network, supporting services like anonymous websites (eepsites), email, file sharing, and secure messaging. i2pd is designed to be resource-efficient and suitable for running on embedded systems or routers while maintaining compatibility with the wider I2P ecosystem.
    Downloads: 211 This Week
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  • 14
    OpenSign

    OpenSign

    🔥 The free & Open Source DocuSign alternative

    The premier open source document signing solution (DocuSign alternative). Welcome to OpenSign, the premier open source docusign alternative - document e-signing solution designed to provide a secure, reliable and free alternative to commercial esign platforms like DocuSign, PandaDoc, SignNow, Adobe Sign, Smartwaiver, SignRequest, HelloSign & Zoho sign. Our mission is to democratize the document signing process, making it accessible and straightforward for everyone.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 15
    Status - a Mobile Ethereum OS

    Status - a Mobile Ethereum OS

    A free (libre) open source, mobile OS for Ethereum

    Status is a secure messaging app, crypto wallet, and Web3 browser built with state-of-the-art technology. Integrated into one powerful super app for private secure communication. Safely send, store and receive cryptocurrencies including ERC20 and ERC721 tokens with the Status crypto wallet. Only you hold the keys to your funds. Status' intuitive design protects you and your funds from attacks.
    Downloads: 2 This Week
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  • 16
    auth

    auth

    Authenticator via oauth2, direct, email and telegram

    This library provides “social login” with Github, Google, Facebook, Microsoft, Twitter, Yandex, Battle.net, Apple, Patreon, and Telegram as well as custom auth providers and email verification.
    Downloads: 0 This Week
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  • 17
    Berty

    Berty

    Berty is a secure peer-to-peer messaging app

    Berty is an open, secure, offline-first, peer-to-peer and zero trust messaging app. Berty is an encrypted and offline peer-to-peer messenger with no central server. Connect with or without an internet connection, message for free, and avoid surveillance and censorship. Berty is fresh off the development line and hasn’t been audited yet. Please keep this in mind when exchanging data.
    Downloads: 9 This Week
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  • 18
    Session for iOS

    Session for iOS

    A Decentralized, Onion Routed, Private Messenger

    Session iOS is the native iPhone and iPad client for the Session secure messaging ecosystem, engineered to bring private, anonymous communication to Apple’s mobile platforms without relying on phone numbers or email addresses. The app supports encrypted one-on-one and group chats, voice messages, file and image sharing, and threaded conversations, all delivered over a decentralized onion network designed to conceal metadata such as sender identity, message timing, and network path. ...
    Downloads: 4 This Week
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  • 19
    Session for Android

    Session for Android

    A Decentralized, Onion Routed, Private Messenger

    Session Android is the official mobile client for Session, a privacy-first messaging protocol that enables secure, anonymous messaging without requiring phone numbers, email addresses, or centralized user accounts. Built natively for Android, the app lets users send and receive end-to-end encrypted text messages, voice notes, images, and attachments in both one-on-one and group chats, all while routing data through a decentralized onion-routing network designed to protect not just message content but also metadata like sender ID, timing, and network location. ...
    Downloads: 18 This Week
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  • 20
    Raivo OTP

    Raivo OTP

    A native, lightweight and secure one-time-password (OTP) client

    Raivo OTP’s iOS application is a native, secure, and user-friendly two-factor authentication (2FA) client that generates time-based (TOTP) and counter-based (HOTP) one-time passwords to protect accounts, all built specifically for iOS devices using modern Swift. It helps users replace or supplement traditional SMS or email 2FA by securely storing OTP secrets and displaying rotating codes that can be synced via iCloud across Apple devices, reducing the risk of losing access when switching devices. ...
    Downloads: 1 This Week
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  • 21
    Vector Element

    Vector Element

    A glossy Matrix collaboration client for the web

    Protect the most sensitive parts of your organization; from senior executive discussion to intellectual property and cybersecurity. An entire communications platform under your control, with end-to-end encrypted voice, video, messaging and collaboration. Easily scales to serve the largest of organizations, supply chains and entire ecosystems. Support thousands of users in a single end-to-end encrypted chat room. Connect millions in real time across multiple organizations. Decentralization...
    Downloads: 0 This Week
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  • 22
    Docker Mailserver

    Docker Mailserver

    Production-ready fullstack but simple mail server

    docker-mailserver provides a production-ready, all-in-one email server in a single container, focused on simplicity and maintainability. It bundles the core mail stack—Postfix for SMTP and Dovecot for IMAP/POP3—then layers in optional anti-spam and anti-virus services, DKIM/DMARC signing and verification, and rate-/abuse-protection tooling. The project emphasizes secure defaults while exposing configuration via environment variables and mounted files, allowing you to define users, aliases, domains, and sieve filters without rebuilding images. ...
    Downloads: 0 This Week
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  • 23
    Liquid

    Liquid

    Liquid markup language. Safe, customer facing template language

    Liquid is a secure, open-source templating language created by Shopify in Ruby. It enables embedding logic (loops, conditionals, filters) within safe, customer-editable templates. Commonly used for rendering storefronts, emails, and static site generation in Shopify and Jekyll-based systems.
    Downloads: 1 This Week
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  • 24
    VoidAuth

    VoidAuth

    Single Sign-On for Your Self-Hosted Universe

    VoidAuth is a self-hosted, open-source Single Sign-On (SSO) authentication provider that simplifies managing user access and identity for a suite of private applications. Built around standards like OpenID Connect (OIDC), it serves as a central authentication authority so that users can log in once and gain secure access to multiple services without duplicating credentials. The platform offers a user and group management interface where administrators can invite users, enable self-registration, and configure policies like multi-factor authentication and password resets with email verification. Designed with flexibility in mind, VoidAuth supports features such as passkeys and customizable branding, making it adaptable to a wide range of deployment environments and aesthetic preferences.
    Downloads: 0 This Week
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  • 25
    OneUptime

    OneUptime

    OneUptime is the complete open-source observability platform

    OneUptime is a comprehensive solution for monitoring and managing your online services. Whether you need to check the availability of your website, dashboard, API, or any other online resource, OneUptime can alert your team when downtime happens and keep your customers informed with a status page. OneUptime also helps you handle incidents, set up on-call rotations, run tests, secure your services, analyze logs, track performance, and debug errors.
    Downloads: 3 This Week
    Last Update:
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