Self-hosted apps that integrate with Microsoft Graph API

4 open-source, self-hostable projects list Microsoft Graph API as an integration.

• DavMailDavMail is a self-hosted, open-source gateway letting any mail client access Microsoft Exchange and Office 365 via IMAP, SMTP, CalDAV, CardDAV, and LDAP.
• Vigil365Self-hosted open-source dashboard aggregating M365 security signals into one UI with alert policies, notifications, RBAC, and scheduled reports. Runs on Windows/Docker.
• Mail HubSelf-hosted temporary email aggregator unifying 10+ providers behind one REST API with auto-polling and code extraction.
• rustmailerSelf-hosted email middleware unifying IMAP, SMTP, Gmail and Graph APIs into REST/gRPC with web client, webhooks, NATS, OAuth2. Single binary, no external deps.