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

* [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.

* [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.

* [Matcha v0.40.1](https://github.com/floatpane/matcha) – Powerful terminal email client built with Go and Bubble Tea, supporting rich content, multiple accounts, and modern TUI features.

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

* [free-email-domains v1.9.22](https://github.com/Kikobeats/free-email-domains) – Comprehensive list of free email domains.

* [Juice v12.0.0-beta.2](https://github.com/Automattic/juice) – Library that inlines CSS properties into HTML style attributes for email and web embedding.