Showing 2947 open source projects for "office open source"

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  • 1
    Mailspring

    Mailspring

    A faster, leaner email client and fork of Nylas Mail

    Mailspring is a fast and lean mail client that’s a new version of Nylas Mail. It’s maintained by one of Nylas Mail’s original authors, with plenty of great features and enhancements such as a new C++ sync engine that allows it to use 50% less RAM. Heavy dependencies have also been removed and the package manager rewritten for even greater speed. Written in TypeScript with Electron and React, it is cross-platform (macOS, Windows and Linux) and designed to be easy to extend.
    Downloads: 23 This Week
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  • 2
    PHPMailer

    PHPMailer

    The classic email sending library for PHP

    PHPMailer – A full-featured email creation and transfer class for PHP. Support for UTF-8 content and 8bit, base64, binary, and quoted-printable encodings. SMTP authentication with LOGIN, PLAIN, CRAM-MD5, and XOAUTH2 mechanisms over SMTPS and SMTP+STARTTLS transports. Validates email addresses automatically. Many PHP developers need to send email from their code. The only PHP function that supports this directly is mail(). However, it does not provide any assistance for making use of popular...
    Downloads: 221 This Week
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  • 3
    Thunderbird for iOS

    Thunderbird for iOS

    Open Source Email App for iOS

    Thunderbird iOS is the official iPhone and iPad email client offering from the Thunderbird project, bringing the capabilities of a feature-rich, open-source email experience to iOS devices with native UI and Apple platform integrations. The app gives users a powerful tool for managing multiple email accounts, including IMAP and POP3 configurations, and supports modern authentication flows like OAuth for popular providers. Designed with mobile usability in mind, it includes familiar gestures, thread views, swipe actions, attachment previews, and integrated search so users can stay productive on the go. ...
    Downloads: 40 This Week
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  • 4
    Google Apps Manager

    Google Apps Manager

    Command line management for Google G Suite

    Google Apps Manager or GAM is a free and open source command line tool for Google G Suite Administrators that allows them to manage many aspects of their Google Apps Account quickly and easily. With GAM you can create and manage users, groups and domains; manage email, security and calendar settings; manage admins and organizations and many more. To use GAM Google Apps Business, Education, Partner or Government Edition is required.
    Downloads: 21 This Week
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  • 5
    theHarvester

    theHarvester

    E-mails, subdomains and names

    theHarvester is a very simple to use, yet powerful and effective tool designed to be used in the early stages of a penetration test or red team engagement. Use it for open source intelligence (OSINT) gathering to help determine a company's external threat landscape on the internet. The tool gathers emails, names, subdomains, IPs and URLs using multiple public data sources.
    Downloads: 46 This Week
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  • 6
    Proton Mail Bridge

    Proton Mail Bridge

    Proton Mail Bridge application

    Proton Mail Bridge is a desktop application that runs in the background on Windows, macOS, and Linux to enable users to access their Proton Mail encrypted email accounts with traditional email clients like Outlook, Thunderbird, Apple Mail, and others via local IMAP/SMTP servers. Because standard IMAP cannot natively decrypt end-to-end encrypted messages, Bridge acts as a translator that downloads encrypted mail, decrypts it locally, and serves it to your preferred mail client over a local...
    Downloads: 16 This Week
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  • 7
    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: 6 This Week
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  • 8

    Isync

    mailbox synchronizer

    A command line utility for synchronizing remote IMAP mailboxes and local maildir-style mailboxes. This is useful for working in disconnected (off-line) mode, such as on a laptop, but also for mirroring mailboxes between servers.
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    Downloads: 92 This Week
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  • 9
    Fetchmail - the mail-retrieval daemon

    Fetchmail - the mail-retrieval daemon

    Client daemon to move mail from POP and IMAP to your local computer

    Fetchmail is a mail retrieval daemon that can download messages from POP3, IMAP, ODMR and ETRN-based stores, with SSL/TLS security including certificate verification, and pass downloaded mail to a local SMTP or LMTP server, or a message delivery agent such as maildrop.
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    Downloads: 112 This Week
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  • 10
    react-email

    react-email

    Build and send emails using React

    react-email is a modern library for building responsive email templates using React components, bringing familiar frontend development practices into email design. It allows developers to create emails using reusable components, making it easier to maintain consistency across different templates and campaigns. The library supports rendering to HTML that is compatible with major email clients, addressing common challenges such as inconsistent styling and layout issues. It integrates...
    Downloads: 11 This Week
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  • 11
    jrean/laravel-user-verification

    jrean/laravel-user-verification

    PHP package built for Laravel 5.* & 6.* & 7.* & 8.* & 9.* & 10.*

    jrean/laravel-user-verification is a PHP package built for Laravel 5., 6., 7., 8., 9.* & 10.* to easily handle a user verification and validate the e-mail.
    Downloads: 6 This Week
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  • 12
    Notifuse

    Notifuse

    Notifuse is an open-source & modern emailing platform

    Notifuse is an open-source, modern, self-hosted emailing and communications platform designed to replace proprietary services like Mailchimp, Brevo, and Klaviyo with a self-managed solution. It’s built with a Go backend and a React frontend to offer both developer-friendly APIs and a user-centric visual interface with enterprise-grade capabilities such as campaign creation, subscriber segmentation, and detailed analytics.
    Downloads: 3 This Week
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  • 13
    K-9 Mail

    K-9 Mail

    Open Source Email App for Android

    K-9 Mail is an advanced, open-source email client for Android that's focused on making it easy to chew through large volumes of email. It's designed to be easy to use by both novice and power users, with plenty of useful features. It has IMAP push email support, support for multiple accounts, support for POP3 and Exchange 2003/2007 (with WebDAV), flagging, filing, signatures and more!
    Downloads: 3 This Week
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  • 14
    Cypht

    Cypht

    Lightweight Open Source webmail written in PHP and JavaScript

    ...Cypht is an application built entirely of plugins, or as we call them, module sets (which is obviously way cooler sounding than plugins), that are executed by the framework. Modules provide a flexible way to add new features or customize the program without hacking the code. Cypht is Open Source (LGPL V2), and written in PHP and JavaScript.
    Downloads: 3 This Week
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  • 15
    Proton Web Clients

    Proton Web Clients

    Monorepo hosting the proton web clients

    Proton Web Clients is a monorepo hosting the web applications for Proton’s suite of privacy-focused services, including the core Proton Mail webmail interface and related web apps like Proton Calendar, Proton Drive, Proton Account, Proton VPN, Proton Pass, and other connected tools. It consolidates all web client code, shared modules, dependencies, and development tooling into a single repository, enabling unified maintenance, consistency of design patterns, and efficient evolution of...
    Downloads: 3 This Week
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  • 16
    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. The app is built to handle complex mailbox structures,...
    Downloads: 2 This Week
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  • 17
    Agentic Inbox

    Agentic Inbox

    A self-hosted email client with an AI agent, running entirely on Cloud

    Agentic Inbox is a self-hosted email client that integrates an AI agent directly into the inbox experience, enabling automated reading, organization, and drafting of emails. It runs entirely on Cloudflare Workers, using serverless infrastructure to manage incoming and outgoing messages without relying on external email services. Each mailbox is isolated with its own storage, ensuring data separation and security while maintaining performance. The system supports full email functionality,...
    Downloads: 4 This Week
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  • 18
    mail-parser

    mail-parser

    Fast and robust e-mail parsing library for Rust

    Stalwart Mail Parser is a high-performance Rust library designed for parsing and analyzing email messages. It efficiently handles complex MIME structures, supports various encodings, and is optimized for speed and robustness. The library is suitable for applications requiring detailed email processing and analysis.​
    Downloads: 2 This Week
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  • 19
    Laravel Mailbox

    Laravel Mailbox

    Catch incoming emails in your Laravel application

    Catch incoming emails in your Laravel application. Laravel Mailbox is a package for Laravel 5.7 and up that will allow your application to catch and react to incoming emails from different services like Mailgun, SendGrid, or the local log driver for debugging purposes. Listen to incoming email messages in a Laravel-Route-like fashion and react to them.
    Downloads: 2 This Week
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  • 20
    Laravel Mail Preview

    Laravel Mail Preview

    A mail driver to quickly preview mail

    This package can display a small overlay whenever a mail is sent. The overlay contains a link to the mail that was just sent.
    Downloads: 1 This Week
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  • 21
    listmonk

    listmonk

    High performance, self-hosted, newsletter and mailing list manager

    Performance and features packed into a single binary. Manage millions of subscribers across many single and double opt-in lists with custom JSON attributes for each subscriber. Query and segment subscribers with SQL expressions. Use the super fast bulk importer (10k records per second) or use HTTP/JSON APIs or interact with the simple table schema to integrate external CRMs and subscriber databases. Visualize and compare campaign performance. Connect external visualization programs to the...
    Downloads: 2 This Week
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  • 22
    DavMail POP/IMAP/SMTP/Caldav to Exchange
    Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP gateway allowing users to use any mail client with Exchange and Office 365, even from the internet through Outlook Web Access on any platform, tested on MacOSX, Linux and Windows
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    Downloads: 997 This Week
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  • 23
    Proton Mail for Android

    Proton Mail for Android

    Proton Mail Android app

    ...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: 1 This Week
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  • 24
    ObjectivePGP

    ObjectivePGP

    ObjectivePGP is an open-source library for iOS and macOS

    ObjectivePGP is an open-source library for OpenPGP encryption, decryption, signing, and verification in Objective-C and Swift. It enables developers to add PGP-based security to iOS and macOS apps.
    Downloads: 1 This Week
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  • 25
    Beautymail for Laravel

    Beautymail for Laravel

    Send beautiful HTML emails with Laravel

    Beautymail makes it super easy to send beautiful responsive HTML emails. Send beautiful HTML emails with Laravel.
    Downloads: 0 This Week
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