Self-hosted apps that integrate with Fastmail

3 open-source, self-hostable projects list Fastmail as an integration.

• email-oauth2-proxySelf-hosted open-source proxy adding OAuth 2.0 to legacy email clients for Exchange, Gmail, and more.
• Keeper.shOpen-source, self-hosted calendar syncer keeping CalDAV, iCloud, Google, Fastmail and Outlook schedules in step, with every Pro feature plus an MCP server.
• calrscalrs is an open-source, self-hosted Rust scheduling platform for CalDAV, Google Calendar, and Exchange. Define bookable meetings, share links — single binary with SQLite