GitHub - calcom/cal.diy: Scheduling infrastructure for absolutely everyone.

Cal.diy is a fully MIT-licensed, community-maintained fork of Cal.com with all enterprise and commercial code removed. It provides open-source scheduling infrastructure for self-hosters who want complete control without license keys or proprietary features. Built on Next.js, tRPC, React, Tailwind CSS, and Prisma with PostgreSQL, it supports Docker-based deployment, manual setup, and one-click deploys to Railway, Vercel, Render, and Northflank. The README covers full setup instructions including environment configuration, database migrations, E2E testing with Playwright, and integration guides for Google Calendar, Microsoft 365, Zoom, HubSpot, and more.