Self-hosted apps that integrate with Google Cloud DNS

3 open-source, self-hostable projects list Google Cloud DNS as an integration.

• CaddyFast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS
• Stalwart Mail ServerSelf-hosted, open-source Rust mail server with calendars, contacts and shared files over JMAP, IMAP, POP3, SMTP and the DAV protocols, plus built-in anti-spam.
• portal-tunnelSelf-hosted tunnel runtime exposing local services via relays with end-to-end TLS, MITM detection, multi-relay failover, and x402 micropayments — no accounts needed.