Alternatives
These products are placed in Scheduling & booking alongside Calendly. The order reflects how much of Calendly’s category footprint each one covers. It is not a ranking, and no company can pay to appear here.
Back to the Calendly record →Event Driven Orchestration & Scheduling Platform for Mission Critical Applications. kestra is open source, written primarily in Java, released under Apache License 2.0. Its repository has 27.5K GitHub stars and 2.8K forks, and was last committed to within the last two weeks. Niched places it in Scheduling & booking.
Open-source event management and ticket selling platform — perfect for concerts, conferences, and everything in between 🎟️ If you find this project helpful, please consider giving us a star ⭐️. Hi.Events is open source, written primarily in PHP, released under Other. Its repository has 3.9K GitHub stars and 692 forks, and was last committed to within the last two weeks. Niched places it in Scheduling & booking.
This PHP-based open source project is a web application for booking medical appointments. Patients can use the platform to easily schedule appointments with their doctors, saving time and effort. The project's source cod. edoc-doctor-appointment-system is open source, written primarily in PHP, released under MIT License. Its repository has 565 GitHub stars and 253 forks, and was last committed to about 9 months ago. Niched places it in Scheduling & booking.
A mature appointment and paid-booking product.
The leading open source scheduling platform.
No description has been captured for this product yet.
A prominent user-friendly scheduling alternative.
No description has been captured for this product yet.
Category placement comes from the classifier and human review, not from a paid submission. A product missing from this page has either not entered the Niched research set or carries no category assignment yet. Absence is never evidence against it. Read the method or submit a missing product.