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📬 Transactional Email

Send password resets, receipts, and alerts from your own mail infra — open source alternatives to SendGrid, Mailgun, and Postmark.

Popular SaaS in this category

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Alternatives to SendGrid

Transactional email API for apps, now Twilio SendGrid.

3 alternatives

Alternatives to Mailgun

Developer-focused transactional email and SMTP relay.

3 alternatives

Open source projects in this category

Postal

Self-hosted mail server for sending transactional and bulk email.

License: MIT Self-host: ★★★★☆

Haraka

High-performance Node.js SMTP server used by big senders.

License: MIT Self-host: ★★★★☆

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📚 Wikis & Documentation

Team wikis, handbooks, and product docs you own — open source alternatives to Confluence, GitBook and Notion docs.

⏱ Time Tracking

Log hours, invoice clients, and monitor billable time — open source alternatives to Toggl, Harvest, and Clockify.

🟢 Status Pages & Uptime

Public status pages and uptime monitoring on your own domain — open source alternatives to Statuspage and Better Uptime.

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