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Cal.com
Open-source scheduling for individuals, teams, and developers building booking into their own products.
Used for
Routing & scheduling
Founded 2021 as Calendso, rebranded Cal.com 2022. Official MCP server (mcp.cal.com, 34 tools); API-first. AGPL open source.
Founded 2021 · Added Jul 5, 2026 · by Discovery
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