* [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.

* [Mailgun with Go v5.16.0](https://github.com/mailgun/mailgun-go) – Go library for interacting with the Mailgun API to send emails and manage events.

* [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.

* [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.

* [Mailspring 1.21.1](https://github.com/Foundry376/Mailspring) – Beautiful, fast mail client for managing emails across multiple platforms.

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

* [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.