C Cal.diy Online appointment scheduling system. Self-hostedOpen sourceBooking and Scheduling 49,437MITNodejsupdated Oct 2026
Q QloApps Customizable and intuitive web-based hotel reservation system and a booking engine. Self-hostedOpen sourceBooking and Scheduling 14,451OSL-3.0PHPupdated Oct 2026
Rallly Create polls to vote on dates and times (alternative to Doodle). Self-hostedOpen sourceBooking and SchedulingPolls and Events 5,328AGPL-3.0Nodejsupdated Oct 2026
Easy!Appointments Allows your customers to book appointments with you via the web. Self-hostedOpen sourceBooking and Scheduling 4,462GPL-3.0PHPupdated Oct 2026
Hi.Events Event management and ticketing platform for conferences, concerts, and more. Offering customizable event pages and embeddable ticket widgets. Self-hostedOpen sourceBooking and SchedulingE-commerce 4,086AGPL-3.0Dockerupdated Oct 2026
A Alf.io Ticket reservation system. Self-hostedOpen sourceBooking and Scheduling 1,626GPL-3.0Javaupdated Oct 2026
L LibreBooking Resource scheduling solution offering a flexible, mobile-friendly, and extensible interface for organizations to manage resource reservations. Self-hostedOpen sourceBooking and Scheduling 839GPL-3.0PHPupdated Oct 2026
O OpenSlides Presentation and assembly system for managing and projecting agenda, motions and elections of an assembly. Self-hostedOpen sourceConference ManagementBooking and Scheduling 660MITDockerupdated Oct 2026
S Seatsurfing Webbased app to book seats, desks and rooms for offices. Self-hostedOpen sourceBooking and Scheduling 315GPL-3.0Dockerupdated Oct 2026
C Chobble Tickets Event ticketing with QR check-in and encrypted attendee records. The complete product is AGPL-3.0 with no open core and no branding requirement, and it runs as an edge script without an always-on server (alternative to Eventbrite). Self-hostedOpen sourceBooking and SchedulingE-commerce 36AGPL-3.0Denoupdated Oct 2026