cal.diy
SchedulingScheduling infrastructure for absolutely everyone.
49k MIT Active
Replaces Calendly 
easyappointments
Replaces Calendly:date: Easy!Appointments - Self Hosted Appointment Scheduler
Stars4,452
LicenseGPL-3.0
Last pushOct 19, 2026
Active
Forks1,581
Open issues + PRs178
LanguagePHP
GitHub topics:appointmentscodeignitereventsgoogle-calendarjavascriptmysqlphprest-api
Source: https://api.github.com/repos/alextselegidis/easyappointments, fetched Oct 21, 2026. "Active" means a push within 30 days of that fetch. Maintainer? Claim this listing.
Other Calendly alternatives
Side-by-side comparison → Related in Scheduling
rallly
SchedulingRallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier.
5.3k AGPL-3.0 Active
Replaces Doodle