Cal.diy is the strongest open-source and self-hosted scheduling candidate if you liked Cal.com but want a community edition without commercial dependencies. Key features include:
- Community fork of Cal.com with enterprise and commercial code removed
- MIT-licensed codebase
- Self-hosted booking infrastructure you control
- No Cal.com account or license key required for the community edition
- Good fit for personal scheduling, demos, hobbyist deployments, and careful small self-hosted setups
Tradeoffs:
- The project recommends personal, non-production use unless you are comfortable owning the infrastructure
- You are responsible for updates, patching, backups, logs, secrets, database security, and monitoring
- Not a good fit for a serious team unless someone is accountable for operations