Open-source scheduling

6 scheduling whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

Cal.diy Grade C

Self-hosted, MIT-licensed community edition of Cal.com for booking pages and calendar scheduling, with enterprise features such as teams, workflows and SSO removed. There is no hosted version.

MIT. Source code
Tymeslot Grade D

Open source (AGPL-3.0), self-hostable meeting scheduling and booking platform. Guests book without creating an account, and hosts get two-way calendar sync with Google, Outlook, iCloud and CalDAV.

AGPL-3.0. Source code
Framadate Grade D

Free online polling service from the French non-profit Framasoft for choosing a meeting date or deciding between options, without registration. Runs on the open source Pollaris software.

AGPL-3.0. Source code
Easy!Appointments Grade D

Self-hosted web application for booking appointments, written in PHP. Customers book online, and staff manage services, providers and schedules, with Google Calendar and CalDAV sync.

GPL-3.0. Source code
Crab Fit Grade D

Free web tool for finding a time that suits a group. Participants mark their availability on a shared grid, and the results show when most people are free. No account is needed.

GPL-3.0. Source code
Rallly Grade D

Open source, self-hostable scheduling poll tool. Create a poll with date and time options, share the link and let participants vote on when they are available.

AGPL-3.0. Source code

Cal.diy Grade C