easyappointments
Scheduling:date: Easy!Appointments - Self Hosted Appointment Scheduler
4.5k GPL-3.0 Active
Replaces Calendly 
cal.diy
Replaces CalendlyScheduling infrastructure for absolutely everyone.
Stars49,200
LicenseMIT
Last pushOct 19, 2026
Active
Forks15,398
Open issues + PRs1,514
LanguageTypeScript
GitHub topics:next-authnextjsopen-sourcepostgresqlprismat3-stacktailwindcsstrpc
Source: https://api.github.com/repos/calcom/cal.diy, 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