LibreBooking

LibreBooking is a free and open source application for managing reservations of shared resources. Originally forked from Booked Scheduler, it runs on PHP and MySQL or PostgreSQL. You can set up calendars, define resource availability, and let users book time slots through a clean web interface. It handles recurring reservations, waitlists, and access permissions for different user groups.

The software supports multiple resource types including meeting rooms, equipment, and vehicles. It includes email notifications, iCal feeds, and a REST API for integration with other tools. The web-based admin panel lets you customize reservation rules, blackout periods, and payment options through plugins. It works on any platform that runs PHP and a supported database.

This tool is best for organizations that need a self-hosted booking system without ongoing license fees. Schools, coworking spaces, and community centers use it to manage shared facilities. The project is maintained by volunteers on GitHub with documentation hosted on Read the Docs. It is licensed under GPLv3.