Self-Hosted Software Booking and Scheduling

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1. Alf.io

The open source ticket reservation system. ([Demo](https://demo.alf.io/authentication), [Source Code](https://github.com/alfio-event/alf.io)) `GPL-3.0` `Java`

2. Calendso

The open-source online appointment scheduling system. ([Demo](https://app.calendso.com/bailey), [Source Code](https://github.com/calendso/calendso)) `MIT` `Nodejs`

3. Easy!Appointments

A highly customizable web application that allows your customers to book appointments with you via the web. ([Demo](https://easyappointments.org/demo/), [Source Code](https://github.com/alextselegidis/easyappointments)) `GPL-3.0` `PHP`