Open-source email software
237 open-source libraries, tools and applications tagged email, ranked by how closely email is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.
237 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| Slicejack/bojler Bojler is an email framework for developing responsive, lightweight HTML email templates that render correctly across popular email clients… | 23 | 1051 | maintenance |
| trumail/trumail Trumail is a free, open-source email verification system written in Go that checks address deliverability via SMTP handshakes with mail ser… | 10 | 1051 | maintenance |
| spymastermatt/thunderbird-monterail A set of userChrome.css themes for Mozilla Thunderbird inspired by the Monterail email client redesign mockups. It includes five color vari… | 32 | 1047 | maintenance |
| Nilhcem/FakeSMTP FakeSMTP is a free, cross-platform dummy SMTP server with a graphical interface, written in Java, that intercepts emails sent by applicatio… | 10 | 1008 | maintenance |
| kenn-io/msgvault msgvault is a Go application that archives a lifetime of email, chat, calendar, and meeting data into a local SQLite/DuckDB store, supporti… | 83 | 2160 | experimental |
| Vue Email Vue Email is a library of unstyled Vue components and render utilities for building email templates with Vue 3 and TypeScript, inspired by … | 53 | 1089 | experimental |
| nylas/nylas-mail Nylas Mail is an open‑source, extensible desktop email client built with Electron, React and Flux. It provides a modern web‑based UI and a … | 10 | 24733 | abandoned |
| swiftmailer/swiftmailer Swift Mailer is a component-based, object-oriented PHP library for composing and sending emails via SMTP or Sendmail, with MIME message bui… | 10 | 9423 | abandoned |
| nylas/sync-engine The Nylas Sync Engine is an open-source email sync platform that exposes a RESTful API on top of IMAP/SMTP, letting applications read and s… | 10 | 3494 | abandoned |
| Formspree Formspree is a form-to-email backend service that lets static sites submit HTML forms by pointing the form action at a Formspree URL, with … | 10 | 2751 | abandoned |
| Thomas101/wmail WMail is a free, open-source Electron-based desktop client for Gmail and Google Inbox, supporting multiple accounts, desktop notifications,… | 10 | 2045 | abandoned |
| charlierguo/gmail A Python library providing a Pythonic interface to Gmail via IMAP, supporting searching, reading, sending, labeling, archiving, and deletin… | 32 | 1810 | abandoned |
| Proton Mail The official Proton Mail Android email client, an open-source app providing encrypted email access on Android. This repository has been arc… | 10 | 1727 | abandoned |
| fossasia/fossasia-nodemailer A small Node.js server that sends emails via the nodemailer library, configured with a Gmail account. It exposes a web interface on localho… | 32 | 1534 | abandoned |
| symfony/swiftmailer-bundle A Symfony bundle integrating the Swiftmailer library for sending emails in Symfony applications. It is no longer maintained because Swiftma… | 10 | 1534 | abandoned |
| billzhong/inbox.py Inbox.py is a minimal asynchronous SMTP server library for Python that lets applications receive email with a simple decorator-based handle… | 32 | 1501 | abandoned |
| thoughtbot/griddler Griddler is a Rails engine that provides an HTTP endpoint for email delivery services (SendGrid, Cloudmailin, Postmark, Mandrill, Mailgun) … | 10 | 1359 | abandoned |
| hardware/mailserver A simple and full-featured mail server distributed as a set of Docker images, bundling Postfix, Dovecot, Rspamd, ClamAV, Sieve, Fetchmail, … | 10 | 1287 | abandoned |
| khamidou/kite Kite is a self-hosted webmail client designed to look like Gmail, with an AngularJS frontend and a Python 2 backend, deployable on a single… | 10 | 1061 | abandoned |
| hmailserver/hmailserver hMailServer is an open-source email server for Microsoft Windows providing SMTP, IMAP, and POP3 services. The project is no longer actively… | 98 | 1029 | abandoned |
| manzinello/mailgo A lightweight JavaScript library that transforms all mailto: and tel: links on a webpage into an accessible modal offering direct actions l… | 10 | 1022 | abandoned |
| mjml-react A React component library that wraps MJML markup to generate responsive HTML emails programmatically. It lets developers compose email temp… | 32 | 998 | abandoned |
| Foundation for Sites Foundation for Sites is a responsive front-end framework providing HTML, CSS (Sass), and JavaScript components for building websites and ap… | 67 | 29798 | maintenance |
| alpkeskin/mosint Mosint is an automated email OSINT tool written in Go that investigates target email addresses by consolidating multiple services. It check… | 23 | 6048 | active |
| AidLux (AidLearning) AidLux (originally AidLearning) is an AIoT development platform that runs a native Ubuntu Linux environment with GUI, deep learning tooling… | 63 | 5812 | active |
| fastmail/Squire Squire is a lightweight (16KB gzipped, zero-dependency) HTML5 rich text editor built in TypeScript that treats arbitrary HTML as the source… | 76 | 4918 | stable |
| freescout-help-desk/freescout FreeScout is a free, self-hosted help desk and shared mailbox application built with PHP and Laravel, serving as an open-source alternative… | 95 | 4596 | active |
| hestiacp/hestiacp Hestia Control Panel is an open-source, lightweight web hosting control panel for Linux servers that provides a web and CLI interface for m… | 98 | 4530 | active |
| AMP AMP (AMPHTML) is an open-source web component framework for building fast, user-first websites, Web Stories, ads, and interactive emails us… | 96 | 14905 | maintenance |
| aliasvault/aliasvault AliasVault is a privacy-first, end-to-end encrypted password manager with a built-in email alias server, letting users create unique identi… | 86 | 3164 | active |
| oiov/wr.do WR.DO is a self-hostable all-in-one domain services platform built with Next.js that bundles short link generation, unlimited domain-based … | 71 | 2279 | active |
| spatie/laravel-mail-preview A Laravel package that adds a 'preview' mail transport which stores sent emails locally and shows an overlay link to preview them. It is de… | 70 | 1295 | active |
| oblac/jodd Jodd is a collection of lightweight Java micro-frameworks and utility libraries with zero external dependencies, including a DI container (… | 23 | 4049 | maintenance |
| sham00n/buster Buster is a Python command-line OSINT tool for email reconnaissance. It finds social accounts linked to an email, data breaches, pastes, re… | 32 | 1420 | maintenance |
| basecamp/mail_view MailView is a Ruby gem that lets Rails developers preview plain text and HTML email templates in a browser without actually sending mail. I… | 10 | 1321 | maintenance |
| mdsecactivebreach/o365-attack-toolkit A Go-based red team toolkit for performing OAuth phishing attacks against Office365 accounts. It uses stolen tokens with the Microsoft Grap… | 32 | 1121 | maintenance |
| ivaldi/brimir Brimir is an open-source email helpdesk/ticketing system built with Ruby on Rails and Zurb Foundation that converts incoming support emails… | 10 | 1363 | abandoned |
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