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Repositories in this selection 63 · UTC 2026-11-04
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1—Nnovuhq / novuThe open-source communication infrastructure for agents and productsTypeScriptNOASSERTION · Restricted / unknownInsufficient rank history40,2494,521——2026-11-02
2—PPHPMailer / PHPMailerThe classic email sending library for PHPPHPLGPL-2.1 · Share derivative sourceInsufficient rank history22,3439,764——2026-10-21
3—Rresend / react-email💌 Build and send emails using ReactTypeScriptMIT · PermissiveInsufficient rank history19,9061,111——2026-10-30
4—Mmjmlio / mjmlMJML: the only framework that makes responsive email easyJavaScriptMIT · PermissiveInsufficient rank history18,2831,007——2026-10-23
5—FFoundry376 / Mailspring:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.TypeScriptGPL-3.0 · Share derivative sourceInsufficient rank history17,9911,065——2026-11-02
6—Nnodemailer / nodemailer✉️ Send e-mails with Node.JS – easy as cake!TypeScriptNOASSERTION · Restricted / unknownInsufficient rank history17,7011,441——2026-10-29
7—BBillionmail / BillionMailBillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZrGoAGPL-3.0 · Share derivative sourceInsufficient rank history16,1741,801——2026-06-11
8—Mmegadose / holeheholehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.PythonGPL-3.0 · Share derivative sourceInsufficient rank history15,5072,009——2024-09-10
9—Mmail-in-a-box / mailinaboxMail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.PythonCC0-1.0 · PermissiveInsufficient rank history15,4541,566——2026-10-22
10—Mmaillab / cloud-mailAn all-in-one email service platform powered by Cloudflare | One-stop email service platform based on Cloudflare | Cloudflare Email MailJavaScriptMIT · PermissiveInsufficient rank history15,34823,084——2026-10-25
11—Llogto-io / logto🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.TypeScriptMPL-2.0 · Share derivative sourceInsufficient rank history14,8371,212——2026-11-02
12—Tthunderbird / thunderbird-androidThunderbird for Android – Open Source Email App for Android (fka K-9 Mail)KotlinApache-2.0 · PermissiveInsufficient rank history14,1752,878——2026-11-03
13—Lleemunroe / responsive-html-email-templateA free simple responsive HTML email templateHTMLMIT · PermissiveInsufficient rank history13,7084,270——2024-08-20
14—OOdysseusYuan / LKY_OfficeToolsOne-click automated tool for downloading, installing, and activating Office.C#GPL-3.0 · Share derivative sourceInsufficient rank history12,9861,242——2024-02-22
15—Eelie222 / inbox-zeroAuthor description: The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.TypeScriptNOASSERTION · Restricted / unknownInsufficient rank history12,8941,653——2026-11-02
16—Ddreamhunter2333 / cloudflare_temp_emailCloudFlare free temp domain email free sending and receiving temporary domain email supports attachments IMAP SMTP TelegramBotTypeScriptMIT · PermissiveInsufficient rank history12,0538,045——2026-11-03
17—Eegulias / EmailValidatorPHP Email address validatorPHPMIT · PermissiveInsufficient rank history11,638233——2026-11-02
18—Ffrappe / frappeLow code web framework for real world applications, in Python and JavascriptPythonMIT · PermissiveInsufficient rank history11,0465,502——2026-11-02
19—MMail-0 / ZeroExperience email the way you want with Mail0 – the first open source email app that puts your privacy and safety first. Join the discord: https://mail0.link/discordTypeScriptMIT · PermissiveInsufficient rank history10,8741,338——2026-10-27
20—Rreacherhq / check-if-email-existsCheck if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.RustMIT · PermissiveInsufficient rank history10,399772——2026-10-30
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