Open source
Cal.com (open source)
Open scheduling infrastructure: booking pages, round-robin and routing you can self-host.
Open-source alternatives to Calendly
Calendly is a scheduling links and routing for booking meetings. If you would rather own the software, keep data on your own server or avoid per-seat pricing, these open-source tools tackle the same problem: run better meetings. Meetings are where decisions happen and then get forgotten. Capture them automatically and turn them into actions.
Closest matches 1
Also open source in Run better meetings 9
Open source
Whisper
OpenAI's open speech-recognition model: transcribe calls, meetings and videos.
Open source
WhisperX
Whisper with word-level timestamps and speaker diarization; great for captions.
Open source
whisper.cpp
Fast C/C++ port of Whisper that runs transcription locally on a laptop.
Open source
Jitsi Meet
Open-source video conferencing you can self-host or embed.
Open source
Vexa
Open-source meeting transcription API with auto-join bots for Meet, Teams and Zoom, plus an MCP server.
Open source
Twenty CRM
Open-source CRM positioned as an alternative to Salesforce, designed for AI.
Open source
Documenso
Open-source DocuSign alternative for sending and signing contracts.
Open source
Odoo
Open-source business apps: CRM, invoicing, inventory, website and more.
Open source
Firecrawl
Turns websites into LLM-ready data: crawl competitors, research leads, feed agents.
Hosted vs open source: what changes
Open source swaps a subscription for setup time. Calendly is hosted, supported and updated for you; with the tools below you (or someone you hire) install, update, back up and secure them. 4 of the 10 with a setup rating here need a developer. Most can also be bought as a hosted cloud plan from the same maintainers, which is a good middle path. Check each licence before you build on it.