Cal.diy: open-source community edition of cal.com

Cal.diy is a fully open-source, MIT-licensed scheduling platform that enables organizations to self-host scheduling infrastructure without enterprise dependencies or licensing fees, offering complete control over sensitive meeting and calendar data. This represents a strategic alternative for IT leaders seeking to reduce vendor lock-in, avoid SaaS recurring costs, and maintain full data sovereignty while managing scheduling workflows internally. Technology organizations should evaluate Cal.diy for scenarios where calendar and scheduling data sensitivity, compliance requirements, or cost optimization justify the operational overhead of self-hosting and infrastructure management.