Kurrier
Self-hosted workspace unifying email, calendars, contacts and storage
Alternative to: gmail, google workspace, fastmail, outlook
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Kurrier is a self-hosted, unified communication platform that brings together email (IMAP/SMTP/SES/SendGrid/Mailgun/Postmark), calendars (CalDAV) and contacts (CardDAV) in one modern web interface. Rather than replacing your mail server, it connects to any existing email provider and layers on cross-device calendar/contact sync plus WebDAV/S3-compatible file storage (Kurrier Drive). Built with Next.js, TypeScript and PostgreSQL, it keeps mail, scheduling and address-book data under your own control.