* [Novu v3.17.0](https://github.com/novuhq/novu) – Unified API for sending notifications through multiple channels, including Inbox, Email, SMS, and Push.

* [MJML v5.3.0](https://github.com/mjmlio/mjml) – Markup language with semantic syntax and components for simplifying responsive email coding and generating responsive HTML.

* [Cloud Mail v3.0.0](https://github.com/maillab/cloud-mail) – Serverless email platform built on Cloudflare Workers with web and API support.

* [Cloud Mail v3.0.0](https://github.com/eoao/cloud-mail) – Cloudflare Workers-based email service offering web UI, D1/KV/R2 storage, and Resend integration.

* [Kurrier v3.0.0](https://github.com/kurrier-org/kurrier) – Modern self-hosted webmail connecting IMAP, SMTP, SES, SendGrid, Mailgun and more into a unified, privacy-focused interface.

* [Nodemailer v8.0.10](https://github.com/nodemailer/nodemailer) – Email sending library for Node.js.

* [Inbox Zero - Your AI Email Assistant v2.30.0](https://github.com/elie222/inbox-zero) – AI email assistant that helps users manage their inbox efficiently.

* [MailerSend Node.js SDK v3.0.0](https://github.com/mailersend/mailersend-nodejs) – Node.js SDK for sending emails and SMS, handling templates, attachments, bulk sends, and analytics.

* [Forward Email v2.8.0](https://github.com/forwardemail/forwardemail.net) – Privacy-focused email service with forwarding, transactional, and newsletter sending features.

* [Mailspring 1.21.0](https://github.com/Foundry376/Mailspring) – Beautiful, fast mail client for managing emails across multiple platforms.

* [go-premailer v1.34.0](https://github.com/vanng822/go-premailer) – Inlines CSS into HTML email for Go.

* [React Email @react-email/ui@6.5....](https://github.com/resend/react-email) – Collection of high-quality, unstyled React components for building responsive, consistent emails with dark mode support.

* [Matcha v0.40.0](https://github.com/floatpane/matcha) – Powerful terminal email client built with Go and Bubble Tea, supporting rich content, multiple accounts, and modern TUI features.

* [enmime v2.4.0](https://github.com/jhillyerd/enmime) – MIME encoding and decoding library for Go, focused on generating and parsing MIME-encoded email messages.

* [Mailtrap Node.js client v4.6.0](https://github.com/mailtrap/mailtrap-nodejs) – Node.js client for sending transactional and bulk emails with sandbox mode, attachments, and API token-based authentication.

* [neomd v0.7.0](https://github.com/ssp-data/neomd) – Minimal terminal email client for reading rendered Markdown messages and composing in Neovim.

* [Onetime Secret v0.25.6](https://github.com/onetimesecret/onetimesecret) – Securely share sensitive information through a single-use link that can be viewed only once.

* [free-email-domains v1.9.15](https://github.com/Kikobeats/free-email-domains) – Comprehensive list of free email domains.

* [react-onesignal 3.5.2](https://github.com/OneSignal/react-onesignal) – OneSignal integration for React and other JavaScript front-ends.

* [useSend v1.9.3](https://github.com/usesend/useSend) – Email sending and management platform with dashboard, API, SMTP, and bulk campaign support.

* [Tuta Mail tutanota-ios-release...](https://github.com/tutao/tutanota) – Secure email service with built-in end-to-end encryption for safe communication across devices.

* [Sendmux Feedback Widget v0.1.3](https://github.com/Sendmux/website-feedback-widget) – Drop-in accessible web component that collects feedback and sends JSON to webhooks or a server-side relay.

* [Wavebox v149.2.35-beta](https://github.com/wavebox/waveboxapp) – Chromium-based browser optimized for productive web-app workflows with tab management, sleeping tabs, cookie containers, profiles, and split-screen.

* [auxx.ai sdk-v0.0.13](https://github.com/Auxx-Ai/auxx-ai) – AI-powered email support ticket platform for Shopify businesses with Gmail and Outlook integration and workflow automation.

* [Better Svelte Email @better-svelte-email...](https://github.com/Konixy/better-svelte-email) – Svelte-based email framework with first-class Tailwind CSS support and built-in preview.